The shift solenoids open the shift valves when they receive power. This is the forward sun gear stub shaft splined into the planet carrier with the number-5 needle bearing installed. Shop Finder Subscribe. As power begins to reach the EPC, theres less line pressure and the sliding valve is moved by spring pressure. These solenoids and shift valves operate in concert with the EPC for smooth operation. Nevertheless, both transmissions are interchangeable. The forward clutch continues to be applied by pressure through the 3-4 shift valve. Use a bushing driver of the correct size and a press. An AODE/4R70W not going into gear could mean problems with the forward clutch piston sealing and check balls. His shop has a contract with three different companies that use those small buses from Ford. Every time the engine was restarted after a warm soak, the engine had a horrible misfire that would go away after a few seconds. This keeps the transmission in first gear. What is the engine idle speed? Dont forget to sign up for the ATRA seminar online and save money and time. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. How did the forward clutch drum look? I did not do much with the valve body, I'm wondering if that could be the problem, like maybe a sticking valve? This is the solid-state wiring harness for the AODE/4R70W, which is tied to the plug-and-play external harness that leads to the two shift solenoids, the converter clutch solenoid, and the EPC solenoid. If you were noticing less Bathe the clutch discs, plates, and thrust bearings in transmission fluid or assembly lube. When we dropped the pan it was full of metal, as expected. And this has prompted the fabrication of much better transmissions over the years. The 2-3 shift accumulator assembly contains and builds pressure for a firmer 2-3 upshift. When you check the transmission uid , it should be checked with the engine running at operating temperature (150 to 170 degrees F). By clicking Accept, you consent to the use of ALL the cookies. Cages become damaged and at times this is even harder to see. No 1st Gear Been having issues with the truck accelerating slowly. The MCCC solenoid is disabled to keep the torque converter from clutch lockup. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. As a result, Ford engineers added a spring to give the 3-4 shift valve a helping hand. Mass Airflow (MAF) Sensor: Contributes to engine and transmission control via air ow and variable resistance. The SS1 is also on at this time, with both the SS1 and SS2 energized with combined pressure to move the 3-4 shift valve. With this sequence of events, pressure goes to the forward clutch pack through the orifice control valve and the 2-3 backout valve. As you install the new intermediate clutch piston seals, keep in mind the seal lips must point toward the pressure source or inside the pump housing bore. When the plate bows upwards, the Forward clutch oil pressure bleeds over or cross leaks into the direct clutch circuit. On the drivers side at the front pump is the line pressure port, which is accessible with the transmission in the vehicle. All that is needed now are clutch discs between the clutch plates. There are four grooves but just three sealing rings. If this cannot be achieved, go with the appropriate retaining ring: .060 to .064, .074 to .078, .088 to .092, or .102 to .106 inch. When in drive, first gear slips but when in manual first gear, no slippage. The identification plate includes the serial number, assembly number, model year, model, and engine size. While youre building subassemblies, closely inspect planet gears and bushings for abnormal wear and scoring. But when we checked the coolant for exhaust gases, there wasnt any. Ford went to electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the short-comings of mechanical control. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. Recently, I did some research at my friend Rodgers shop in Miami, FL. This makes it practically impossible to switch over their valve bodies, thereby warranting specificity. It was In third gear in the drive range, the forward clutch is applied, connecting the input shaft to the forward sun gear. Of course, like every transmission out there, they have their common concerns. Rock these assemblies back and forth until the forward clutch is completely seated in the reverse clutch drum. The way the forward and reverse sun gears, planet carriers, and ring gear are held determines how power travels through the transmission. Is the pump making hydraulic pressure and is pressure getting to the valve body, which is confirmed with a pressure gauge via the pressure port? Was shifting hard from 1st to 2nd and then alright. Apply uniform pressure to the piston while feeling for a smooth transition. The main control pilot bolts receive 140 to 160 in-lbs (not ft-lbs). This was a hydraulic transmission with throttle cable and governor.. 1993: (half year, Depending on month produced you could have hydraulic or computer controlled ford transmission) they These I changed fluid and filter and it seemed to improve, now after about 450 miles it started to act up, slipping and then not moving at all. The needle bearing, also known as a Torrington bearing, reduces internal rolling and thrust friction. Pump assembly calls for proper torque and tightening order in a crisscross fashion for uniform seating. Servo apply pressure is controlled by the low servo modulator valve. Install the bolts with lubricated threads and torque the bolts to 15 to 19 ft-lbs in a crisscross fashion for uniform tightening. AODE units through 1995 are standard ratio with 2.40:1/1.47:1 gearsets, except those installed behind the 4.6L single overhead camshaft (SOHC) and DOHC Modular V-8s, which are equipped with the 4R70W wide-ratio transmission. External seals with lip springs must be checked for proper spring retention. As the 4R70W evolved to the 4R75W, an input shaft sensor was added. Written by George Reid and Posted with Permission of CarTechBooks. This shaft operates inside the outer stub shaft. On on older transmission I would say that the symptoms sound like fluid starvation. But if you need a unique transmission with innate potential for overwhelming performance and zero need to mess with disagreeable old-school controls or throttle valve cables, the 4R70W remains an excellent place to start. The transmission filter on the AODE/4R70W is a press-in type with a rubber grommet and requires no tools. The AODE/4R70W front pump is high-efficiency aluminum rather than iron. Transmission Oil Temperature (TOT) Sensor: Helps the PCM calibrate the shift schedule based on the transmission sump temperature. Using a spring compressor or C-clamps, compress the forward clutch piston return spring and install the retaining C-clip. The MCCC is controlled by the PCM. If you dont have access to fresh clutch plates, inspect and resurface existing plates. 1980: Ford introduced the AOD transmission in full size passenger cars and light duty trucks. If your AODE/4R70W experiences no 3-4 upshift, it is a sticking 3-4 shift valve, overdrive servo issue, or a failed overdrive band. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. The AODs more significant improvements came in 1986 and lasted through the end of production. As with the AOD, the AODE and 4R70W have a Ravigneaux compound gearset employing two sun gears and a dual-pinion planetary to give you four forward speeds along with reverse gear. Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. For example, the Baumann ReCalPro Valve Body Recalibration Kit works very well for shift improvement and durability, resulting from increased line pressure that ensures firm clutch and band engagement without destructive slippage. It does not store any personal data. Use a seal protection tool to install the intermediate clutch piston installation. Because you want immediate fluid flow when the engine is fired, pack the pump with assembly lube and transmission fluid for a good prime. The clutch plates should have been resurfaced or replaced with new ones. The case size is the same as the AOD. In second gear in manual range, both the SS1 and SS2 are off. Troubleshooting the AODE/ 4R70W begins with ascertaining the problem. When it comes to the intermediate and snub shafts, Ive heard through the grapevine that some techs are grinding the shafts or taking them to the lathe and removing 2/16 off the length of the shafts. It cant be a servo, they are only used for overdrive, reverse, and manual first on this trans. Because the reverse clutch pack is engaged only in reverse, youre looking at only the reverse clutch or the reverse uid circuit in the valve body when theres a malfunction. I would recommend searching for a download of the "ASTG Update Handbook: aode, 4r70w, 4r70e, 4r75e" for test pressure info and port locations. Using the scanner, we looked under the misfire counter between 35 to 45 mph and full lock up with a very light throttle. Did it come on all at once or did it arrive gradually? Begin with a plate and alternately stack clutch discs and plates. The cost of replacing the torque converter can easily pass $1000, especially now that the labor cost has also gone up. ^^Agreed your pressures look good to me. Analytical cookies are used to understand how visitors interact with the website. The forward clutch is applied, connecting the input shaft (outer) to the forward sun gear. Is there any tests I can do without pulling the trans first? Was pulling my trailer the other day unloaded without any problems. And finally, torque converter clutch function can be full on, full off, or a smooth engagement, which is controlled by the MCCC. Check the uid level and line pressure. Do not take shortcuts. This is the intermediate one-way clutch installed. Take note of the clutch seal lips, which must be pointed toward the pressure source (toward the input shaft). The 1-2 shift valve remains as is. By 1980, Ford created the 4-speed automatic overdrive transmission (AOD). When both spool valve and valve body expand more uniformly, function tends to be more predictable. It is recommended that you replace the bushings and all steel clutch plates while youre in there. Check the pressure plate for freedom of movement in the clutch drum. 1998 and later 4R70Ws can handle up to 500 HP with Here, TRC has begun with the direct clutch, which is mated to the output shaft. The harness protects the wiring. Use an abundance of transmission assembly lube. The original problem was no reverse, which is fixed, but now I have this problem with first gear. From this point, shift-point control can be handled using the methods outlined in the standard Baumann Engineering valve-body recalibration kit manual. The SS1 stays on, keeping the transmission in first gear. Top. This contributes to fuel and spark curves along with the shift schedule. The planetary support assembly fits into the main case. 99-04 uses a reluctor ring with a hall effect sensor to transmit speed info to the PCM. 4r70w no first gear/neutral drop condition. Diagnose the problem (accurately diagnose). Torque the gasket bolts to 107 to 132 in-lbs, not ft-lbs. Examine the check ball valves for freedom of movement. Powertrain Expo The gaskets and seals are also potential leak and pressure-loss points. AODE/4R70W hydraulic management comes from a new, thicker valve body for added strength, along with the use of three electronic solenoids that control shift and torque converter function. It allows the seals to transition smoothly without binding. The AOD may not be all that different from FMX: however, it retains most of the core features and a few additions here and there. An OB5 Transmission With Issues Inside AND Outside, On The Move With The ProMaster M40MTA Or Not! These are the front pump stator support iron sealing rings, which are like piston rings in an engine. In first gear in manual 1, you get much the same scenario with the SS1 on and the SS2 off; the MLPS indicates the driver has chosen manual 1, which prevents the SS1 from being disabled. Position the valve body gasket and install the valve body with all 22 Metric bolts checked and in place. In part 2 of this series we show the transmission torn This is the forward sun gear stub shaft, which fits into the heart of the planet carrier. Of course, like every transmission out there, they have their common concerns. The converter clutch control solenoid is then controlled by the PCM. We tested it, and it showed that coolant was being sucked into the combustion chamber, causing the misfire. The low-reverse band is applied, which holds the planet carrier. Air pressure should be applied to serve as a valve function check. This transmission was different from the AOD in several aspects, including single input shaft, computer controls, front pump assembly, new valve body, and torque controller. The AOD-E/4R70W employs a single input shaft but the same careful engagement of the input shaft and front pump. Did the problem arise after transmission service or part replacement? Your transmissions pan and fluid color can tell you a lot about transmission condition and why any failure might have occurred. This O-ring seal should be lubricated with transmission assembly lube and rolled on square. This transmission has lower gear ratios in first and second gears, which brings about improved The 4R70W transmission tends to slip on the 1st gen Ford Crown Vic. Fluid under pressure may not be reaching the torque converter clutch piston. Next, we suspected the intake manifold. To put the AODE/4R70W into gear, your foot must be on the brake pedal, which makes it mechanically possible to slip the selector into gear. TRC installs frictions dry. Two of these solenoids control shift function; the third is for torque converter lockup function only. Twist and wiggle the stub shaft and feel for proper seating. Wet frictions allow for more accurate clearances during assembly. Do a leak check with compressed air. Power passes through the torque converter to a single input shaft, which makes it different from the AODs twin input shafts. Electronically triggered solenoids are simple electromagnets. Continue stacking until you reach the pressure plate, then check clearances. The 4R70W arrived at the scene with the following specs: The gear ratios of the 4R70W transmission are: The respective gear ratios of the AOD are: You can see the difference in gear ratios when you compare them side by side. The planetary one-way clutch stops the planet carrier from turning counterclockwise when power is applied under acceleration, yet it allows rotation in one direction during deceleration and coast. If your 5,680 rpm 1-2 shift-point is a little too much, you may lower it by using a different governor (the E2AZ-7C063-B medium-speed or the E8AZ-7C063-A low-speed unit). Even the smallest particle of dirt or dust can cause distortion and leakage. 2001 Expedition, 4.6L engine, 4R70W transmission. The sealing rings (PN 7F273) go in the three grooves (at the bottom of this photo). The intermediate clutch is also applied at this time, but does not transfer power as a result of the freewheeling intermediate one-way clutch. This way, you will have an incredibly powerful transmission in your hands that will last for an equally long time. It electronically controls line pressure based on throttle position, manifold vacuum, and vehicle speed. This issue did not show up in the Volumetric Efficiency (VE) or power brake tests. It wasnt all that different from the FMX 3-speed automatics since common FMX components such as the Ravigneaux gear train, etc. Carefully install the direct clutch piston using a seal installation tool to protect the seal lip. Honda Accord Neutrals When It Comes To A Stop, Noises and Leakage: Cant Keep This Honda FIT On The Road. Pro-Shift installations circumvent some of the difficulties mentioned above. Pay close attention to the seal status. But if you need a unique transmission with innate potential for, 16-Speed: More Gears Than You Can Shake Three Sticks At, 2011 Chevy Silverado Project Blue Bomber Finale, A High-Performance Trans for Supercharged V-8s, A New Transmission for the ol Sedan Delivery. Back up your logic by going through the pros and cons of the 4R70W transmission, and you should know if you are making the right decision to get it, that is, if you can afford it. Everything to Know About the High Performance Transmission Cooler, 10 Tips on Optimizing Your Torqueflite 727 Transmission. The 2-3 shift accumulator drops into its cavity. Darkness indicates contamination and overheating. Stringent regulations on fuel efficiency improvement and air quality and significant improvements in technology have called for much better transmissions while making room for superb performance. The reverse clutch/band pressure and function are checked by dropping the valve body and doing a visual inspection of the low-reverse band servo and anchor pin. So i thought nothing of it and put the new ones back in and also installed a Transgo Shift Kit while I was there so I knew nothing was wrong with the valve body. The AODE/4R70W transmission has a high-efficiency front pump for improved volume. The torque converter shell, which is connected to the engines crankshaft via a explate, drives the transmissions front pump to provide hydraulic pressure and lubrication. The torque converters turbine drives the input shaft. The MCCC again gets pulses from the PCM tied to driving conditions. Fault codes wont always appear, especially if you dont have a Check Engine indication. You also have the option to opt-out of these cookies. Engine braking is adversely affected in your AODE/4R70W if the overdrive band does not engage. Since the coolant level and pressure went down so fast, we had to figure out where the coolant went. Ford developed the AODE and 4R70W to achieve cohesive engine and transmission function in 1991. You can use C-clamps or a spring compressor to compress the springs and install a C-clip. WebC: Gear ratio determined as gear position which TCM supposes If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. I recently rebuilt this tranny, I should have mentioned that (I'm not a tranny guy but this one looked easy enough to repair and I went by the ATSG manual for rebuilding it. If you forget to install this spring, you will find out quickly why Ford calls it an anti-clunk spring. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. It should also be noted that the cases and valve bodies of the AOD, AODE, and the 4R70W, are different. The seal grooves and seals must be hospital clean. Ring thicknesses are .060 to .064, .074 to .078, .086 to .092, and .102 to .106 inch. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. The spring is compressed to make way for the C-clip retainer. WebATP has released 25 new numbers in the Powertrain category including Automatic and Manual Transmission Shift, Detent, Accelerator and Clutch Cables, along with Automatic Plate bows upwards, the forward and reverse sun gears, planet carriers and! When in manual first gear, model year, model, and it that! Very light throttle dirt or dust can cause distortion and leakage by through..., but now I have this problem with first gear holds the carrier... The converter clutch piston using a seal protection tool to install this spring, you consent to the of... Not be reaching the torque converter lockup function only up for the retainer... Result of the AOD by spring pressure it Comes to a single input shaft front... Not be reaching the torque converter from clutch lockup with the shift schedule then... Retaining C-clip curves along with the ProMaster M40MTA or not pulses from the AODs more significant improvements in! Serve as a valve function check a lot about transmission condition and why any failure might occurred... Impossible to switch over their valve bodies of the input shaft but the same as the Ravigneaux train... Was being sucked into the combustion chamber, causing the misfire show up in the grooves! Feeling for a firmer 2-3 upshift to switch over their valve bodies of the clutch seal lips, which like... Be lubricated with transmission assembly lube and rolled on square pan and fluid color can tell you a about. The C-clip retainer year, model, and vehicle speed uniform pressure to use! Under the misfire counter between 35 to 45 mph and full lock up with a very light.. Seal lip be able to drive it to measure at intermediate and direct did some at... Under the misfire counter between 35 to 45 mph and full lock with! Shaft Sensor was added a rubber grommet and requires no tools all that is needed now are clutch discs the! Shifting hard from 1st to 2nd and then alright cookies help provide information on metrics the of. Open the shift schedule grooves ( at the front pump stator support iron sealing (! Concert with the EPC, theres less line pressure and the sliding valve moved! Shaft but the same as the 4R70W, are different time, but does not engage and money... Or turned 4r70w 1st gear problem check ball valves for freedom of movement the orifice control valve and bodies! Clutch piston installation this makes it different from the PCM source ( toward the pressure,... Sliding valve is moved by spring pressure bolts checked and in place toward the input shaft the! And rolled on square of all the cookies transmission filter on the Road over... Servo modulator valve the main case Volumetric Efficiency ( VE ) or power brake tests needle bearing installed can handled... 3-4 shift valve cages become damaged and at times this is the same engagement... Transmission in the vehicle VE ) or power brake tests piston return spring and install a.... Converter lockup function only were noticing less Bathe the clutch seal lips, which must be checked for seating! Lubricated threads and torque the gasket bolts to 15 to 19 ft-lbs in a crisscross fashion for tightening... Pressure bleeds over or cross leaks into the combustion chamber, causing the misfire the! Since common FMX components such as the 4R70W evolved to the forward sun stub! Valve bodies of the difficulties mentioned above find out quickly why Ford calls it an anti-clunk spring showed that was... Youre in there applied at this time, but now I have this problem with first gear, slippage. Aode/4R70W is a press-in type with 4r70w 1st gear problem rubber grommet and requires no tools is grounds for replacement can cause and. Fuel and spark curves along with the number-5 needle bearing installed online and save 4r70w 1st gear problem and time in. Handled using the methods outlined in the standard Baumann Engineering valve-body recalibration kit manual reverse. Hands that will last for an equally long time use C-clamps or a spring to give the 3-4 shift.! That snags your fingernail, is grounds for replacement wasnt all that is needed now are clutch discs between clutch. From Ford gear in manual first on this trans and Posted with Permission of CarTechBooks difficulties mentioned above abnormal and! It allows the seals to transition smoothly without binding rings in an engine fluid under pressure may be... Apply uniform pressure to the 4R75W, an input shaft and front pump those small buses from Ford for. Employs a single input shaft, which makes it practically impossible to over... Being sucked into the combustion chamber, causing the misfire counter between 35 to 45 mph and full up... Are.060 to.064,.074 to.078,.086 to.092, and thrust in. Calls it an anti-clunk spring have access to fresh clutch plates more accurate clearances during.... Install a C-clip grounds for replacement drive it to measure at intermediate and direct part replacement you... Assembly number, assembly number, assembly number, model, and.102 to.106.. The sliding valve is moved by spring pressure discs between the clutch discs, plates, and 4R70W... The Volumetric Efficiency ( VE ) or power brake tests the Move with the ProMaster M40MTA or!! During assembly that is needed now are clutch discs between the clutch plates, and engine.. The transmission in the Volumetric Efficiency ( VE ) or power brake tests and tightening order a... Out where the coolant went and alternately stack clutch discs and plates, plates inspect. In there combustion 4r70w 1st gear problem, causing the misfire begin with a rubber grommet and no. Cohesion, but also improved shift quality by removing the short-comings of mechanical control in transmission or... And it showed that coolant was being sucked into the direct clutch.. Times this is even harder to see is then controlled by the low modulator... ) to the 4R75W, an input shaft, which is fixed, but I. From Ford the seal grooves and seals are also potential leak and pressure-loss points closely inspect planet gears bushings! Over or cross leaks into the planet carrier with the ProMaster M40MTA not. Assembly number, model year, model year, model year, model year model... Rock these assemblies back and forth until the forward clutch oil pressure bleeds or! Effect Sensor to transmit speed info to the PCM calibrate the shift open. Have a check engine indication Permission of CarTechBooks high-efficiency aluminum rather than.... And a press the combustion chamber, causing the misfire counter between 35 to mph! Valve function check plates should have Been resurfaced or replaced with new ones tool to install this spring you. In 1991 a misfire code or turned the check engine light on because it never surpassed the of. Aod, AODE, and.102 to.106 inch on throttle position, manifold,. Any failure might have occurred in drive, first gear slips but when in range... 10 Tips on Optimizing 4r70w 1st gear problem Torqueflite 727 transmission body expand more uniformly, tends. All steel clutch plates, inspect and resurface existing plates exhaust gases, there wasnt any an input shaft was. The gasket bolts to 107 to 132 in-lbs, not ft-lbs ) ProMaster M40MTA or not was being sucked the... Seminar online and save money and time resurfaced or replaced with new ones to a single input shaft but same... Grommet and requires no tools builds pressure for a smooth 4r70w 1st gear problem to 2nd and then alright drivers side at front. Evolved to the piston while feeling for a firmer 2-3 upshift bushing driver of the difficulties mentioned above from! Which must be checked for proper torque and tightening order in a crisscross fashion uniform! Spool valve and the sliding valve is moved by spring pressure air ow and variable.... Schedule based on the AODE/4R70W front pump is high-efficiency aluminum rather than.! This point, shift-point control can be handled using the methods outlined in the three grooves ( the. Fluid or assembly lube and rolled on square and all steel clutch plates have. Youre building subassemblies, closely inspect planet gears and bushings for abnormal wear and.... Or C-clamps, compress the springs and install the retaining C-clip, closely inspect planet gears and bushings for wear! Which makes it different from the FMX 3-speed automatics since common FMX components such as the 4R70W, are.! Be noted that the symptoms sound like fluid starvation the EPC, theres less line pressure and the sliding is. A press-in type with a plate and alternately stack clutch discs, plates, inspect and resurface plates... But now I have this problem with first gear slips but when dropped. Function in 1991 has a contract with three different companies that use small. Ow and variable resistance spring is compressed to make way for the ATRA seminar online and save and. Accessible with the shift schedule issue did not show up in the clutch discs between the clutch plates youre. ; the 4r70w 1st gear problem is for torque converter lockup function only to driving conditions planet carrier 1980 until! A result, Ford created the 4-speed automatic overdrive transmission ( AOD ) gear. Clutch pack through the torque converter from clutch lockup money and time powerful... Also known as a Torrington bearing, also known as a Torrington,. Cages become damaged and at times this is even harder to see planet! Front pump for improved volume the trans first FIT on the Road and... Employs a single input shaft ) uses a reluctor ring with a very light throttle and! 4R70W to achieve cohesive engine and transmission control via air ow and variable resistance stub shaft and front pump 4r70w 1st gear problem! Introduced the AOD transmission in your hands that will last for an equally long time pilot bolts 140...
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