This means theres modulated line pressure from the EPC to the 1-2 shift valve (the SS1 is on). Or it could be a number of sensors both internal and external. The lap joint must meet head-on and be perfectly aligned. Soak this bearing in transmission assembly lube and make sure it sticks to the case. Air pressure should be applied to serve as a valve function check. Here are the top Ford Crown Victoria problems of the 1st generation, years 1993 to 1997. On the drivers side at the front pump is the line pressure port, which is accessible with the transmission in the vehicle. This keeps the transmission in first gear. Ford went to electronic control not only for engine/transmission cohesion, but also improved shift quality by removing the short-comings of mechanical control. The computer never set a misfire code or turned the check engine light on because it never surpassed the threshold of time and occurrences. Instead, the problem is with the low servo modulator valve, low-reverse band servo, number-6 shuttle ball, or a failed low-reverse band. The 2-3 shift accumulator drops into its cavity. Brake On/Off (BOO) Switch: When you apply the brakes, the signal assists in torque converter clutch control. If you encounter any binding, chase the threads and remove the debris. Examine all valve body passages, valves, and springs for obstructions or binding issues. The fluid is brand new and at the correct level. Mass Airflow (MAF) Sensor: Contributes to engine and transmission control via air ow and variable resistance. The purpose of making the AOD electronic was to create more cohesive engine and transmission function. Accelerating those 20 mph in 1st gear instead of 2nd gear would get me faster time, but for that, I need to stop the slip by engaging the TCC. Note the proper installation and how the rollers are located (arrows). The direct drum was burnt, as well. A seal lip pointed the wrong way is a guaranteed leaker. In fourth/overdrive, the SS2 remains energized and the 2-3 shift valve stays put. 2.7K views 3 years ago. It allows the seals to transition smoothly without binding. A switch to the wide-ratio gearset increases the 1-2 shift-point by 18.3 percent (multiply 4,800 rpm by 1.183 to obtain a new shift-point of about 5,680 rpm). Overloading the 4R70W transmission is a bad idea. Slowly walk the tool around, protecting the seal lip. In contrast to the AOD, the rotor is installed only one way where it engages the torque converter drive hub. WebWe offer a complete suite of transmission repair, maintenance, and part replacement services, flexible payment plans, and one of Canadas best warranties. WebSHORT PROBLEMS (4 problems 22 points total) Partial credit may be given. The RDI was ordered and taken to the bench for disassembly. Pressure against the seal lip is self-sealing and fail-safe. To get a free quote on transmission system services from a Mister Transmission near you, you can: Phone (800)-373-8432. Check the valve body bolts to make sure theyre tight, and check the clutch frictions/steels. This post will discuss the 4R70W and compare it to other well-known Ford transmissions, its pros and cons, and how to enhance it, especially in terms of getting the best performance. We noticed the coolant level was low, so we topped off the coolant and did a leak-down test in the cooling system, pressurizing the radiator (which lasted 10 minutes). Air-Conditioning Clutch (ACC): This signal controls the idle speed and electronic pressure control (EPC) input, which affects the shift schedule. The number-4 thrust needle bearing installs inside the forward sun gear drive shell. In other words, are the two pump halves securely tightened? This drain hole must be at 6 oclock. If you get a harsh 2-3 upshift, the problem is likely the 2-3 accumulator or excessive line pressure. The overdrive band is applied, holding the reverse sun gear stationary to facilitate engine braking. Attachment bolts receive 80 to 100 in-lbs (not ft-lbs). The shift solenoids open the shift valves when they receive power. You can see the difference in rotor design with fewer teeth and more cavity space between teeth. Generously lube this assembly and install it, along with the cover. The forward sun gear drive shell rides against the number-5 needle bearing. It can also mean reverse clutch piston seal problems. 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. This makes it practically impossible to switch over their valve bodies, thereby warranting specificity. Be sure to think about when the malfunction occurs Does it occur during upshift, downshift, coasting, or engagement? So the valve body on 4r70w and maybe 4r75w tend to wear out so replacing the whole valve body is recommend instead of trying to fix the valve bores in my opinion you are eliminating further issues, valve body on eBay good with one year warranty 65$ bucks thats super cheap fix for these mysteriously instantaneous loss of forward gears without WebThe 4R70W/4R75W transmission is susceptible to issues that include: loss of forward gears, intermediate clutch failure, loss of second gear, delayed reverse or shudder in reverse, delayed/no lock-up, harsh 2-3 shift, loss or slipping in forward gears, direct clutch failure or loss of third and fourth gears, low pressure or harsh shifts and front 178 subscribers. Here, TRC has begun with the direct clutch, which is mated to the output shaft. I would recommend searching for a download of the "ASTG Update Handbook: aode, 4r70w, 4r70e, 4r75e" for test pressure info and port locations. Necessary cookies are absolutely essential for the website to function properly. The passengers side of the AODE/4R70W exhibits the bar code identification plate, multiplex plug, transmission cooler line connections, and dipstick tube provision. First gear isnt usually the first to go (no pun intended) on the 4r70w. Stagger the gaps and give these rings plenty of transmission assembly lube. Also, did you use seal protectors to install the pistons? Closely inspect all hard parts for scoring and cracking. If you manage to get through gears 1, 2, and 3, a transmission that fails to make overdrive (fourth gear) is not an electrical issue. Make sure that if your output shaft seal has a lip spring it doesnt pop out. At WOT, you want high line pressure for firm clutch and band engagement. The same thing applies to automobiles with the AOD Electronic Controls in the 1990s. The AODE/4R70W is a 4-speed, rear-drive automatic overdrive with electronic control, hence the AODE designation. Ring thicknesses are .060 to .064, .074 to .078, .086 to .092, and .102 to .106 inch. Although you can swap AOD-E and 4R70W geartrain components into an AOD, it makes more sense to opt for the gear ratio advantage of the 4R70W, which is geared more for the Modular engines that dont have the low-end torque pushrod small-blocks have. Use plenty of lubrication on the center support bushing. The extension housing gets this silicone-lined gasket on the extension housing prevents leaks. If theres no power to the EPC, you get maximum line pressure holding the valve all the way in. All bushings and thrust bearings should be replaced in the interest of durability. Always make sure the seal lips are pointed in the right direction, toward the pressure source (the bore), and that theyre not distorted. Get this wrong and you will experience an accumulation of fluid in the tailshaft/extension housing. Modulated Converter Clutch Control (MCCC) Solenoid: An electronically fired ball valve. Intermittent Fail Safe, Codes, Related Concerns and Solutions, The ZF 8-Speed Transmission Fluid and Filter Change, Tackling Clutch Failure in the GM 6L80/90, An Audi Opportunity! The direct clutch should be fitted with new steels and frictions. There are two bands, two one-way clutches, and four friction clutches used to lock and drive the gearsets. Most automatic transmission shops have the equipment to check torque converter function. The extension housing received a new bushing. Fords AOD evolved into a highly successful mechanically modulated transmission from its 1980 introduction until production ended in 1991. They are bad for breaking at the snap ring land. Torque the bolts in a strict pattern to prevent warping. An early AODE / 4R70W can typically handle 25-50 HP above stock power levels. Keep in mind, Reverse does not use a solenoid 'like' the forward gears. Be very careful not to scratch the clutch piston. Subscribe Now Change Your Address, Yes, I would like to receive emails from Gears Magazine. After a couple of minutes, it cleared and ran well again, but there was a lot of white smoke coming out of the tailpipe. If clearances are not within specifications, exchange the snap ring with one of appropriate thickness. Unless your vehicle has a sealed transmission, you will be able to pull out the dipstick and read the levels. It is unknown how many cycles a Belleville spring can take before it breaks. To get a better understanding of how the processor controls your AODE/4R70W transmission, heres an explanation of what happens. WebFord 4R70W/4R75W Transmission Information. If theres little or no pressure, the front pump or filter might be the problem. It can operate at zero duty cycle (valve closed) or maximum duty cycle (valve wide open). Definitely measure the forward pressure at its port but you would have to be able to drive it to measure at intermediate and direct. According to ASTG all your line pressures are fine. When the transmission is in slip mode, the MCCC is quickly cycled on and off in a pulse pattern for maximum efficiency. A modified version of the AODE was launched in 1993, but with a different name. I would start by removing the valve body and inspecing it first. Any scoring, especially scoring that snags your fingernail, is grounds for replacement. Install the bolts with lubricated threads and torque the bolts to 15 to 19 ft-lbs in a crisscross fashion for uniform tightening. 2. The MCCC solenoid is disabled to keep the torque converter from clutch lockup. Renew Subscription If they are heat cracked or bluish, do not reuse them. The lip needs to face the fluid. Check for proper spring alignment and positioning. Fault codes wont always appear, especially if you dont have a Check Engine indication. Brief History of the Ford 4R70W Transmission, As mentioned earlier, no stock transmission is perfect in every aspect. When the plate bows upwards, the Forward clutch oil pressure bleeds over or cross leaks into the direct clutch circuit. This way, you will have an incredibly powerful transmission in your hands that will last for an equally long time. It is recommended that you replace the bushings and all steel clutch plates while youre in there. According to Ford, at the 3-4 shift valve, SS1 pressure (the SS1 is on) isnt enough to overcome spring pressure, keeping the valve in. The 2-3 shift accumulator assembly contains and builds pressure for a firmer 2-3 upshift. Be very careful with this servo piston and watch the seal lip during installation. The vehicle in question was a 2014 Ford Econoline E-250 bus. This roller clutch allows drum rotation in one direction only, like a ratchet. This cookie is set by GDPR Cookie Consent plugin. Rock these assemblies back and forth until the forward clutch is completely seated in the reverse clutch drum. The intermediate stub shaft splines into the planet carrier. Car manufacturers began to wise up in the 70s and started manufacturing fuel-efficient vehicles. If clutch and servo are an issue then internal work is needed. Electronic control affects shifting, the converter clutch, and line pressure control for seamless operation. Ford recommends the following, which can be performed with the transmission in the vehicle: Pull the dipstick and check the uid condition and level. Cages become damaged and at times this is even harder to see. Any seal bind is a guaranteed leak. Use plenty of lubrication as a pre-lube and for adhesion. The MCCC engages and disengages the torque converter clutch. There was a need for engine and transmission performance to be linked through the systems PCM, which makes the AODE and 4R70W different transmissions from the AOD. A bad or failing solenoid may cause the vehicle to experience hard or erratic shifting when slowing down or coming to a stop. As mentioned earlier, no stock transmission is perfect in every aspect. (7 points) A car traveling on a flat (unbanked), circular track of radius R accelerates Pressure from the manual valve continues to pass through the 2-3 shift valve, releasing the overdrive band servo. Please register or login to enable Dark Mode. Each transmission build shop has its own approach to assembly. Advertising - I did not do much with the valve body, I'm wondering if that could be the problem, like maybe a sticking valve? When it is time to compress clutch return springs during clutch piston installation, opt for the use of C-clamps if you dont have access to a clutch spring compressor. The 4R70W transmission tends to slip on the 1st gen Ford Crown Vic. Lose the spring and you will have slip-yoke leakage. The spring is compressed to make way for the C-clip retainer. Replace the front pump bushing by pressing out the old bushing and installing the new one. Analytical cookies are used to understand how visitors interact with the website. 4r70w no first gear/neutral drop condition. If you install the rotor backward with the beveled edge toward the intermediate clutches, the torque converter does not engage the pump. The converter clutch control solenoid is then controlled by the PCM. The Ravigneaux planetary gearset is a combination of two sun gears and both long and short pinion sets. And this has prompted the fabrication of much better transmissions over the years. When the AODE/4R70W shifts into second gear in drive, the for-ward clutch is applied, connecting the input shaft to the forward sun gear. I have measured the plate bowing upwards as If the SS2 isnt energized, there is a 1-2 upshift, but the transmission never gets out of second gear. The planetary one-way clutch overruns. The MCCC again gets pulses from the PCM tied to driving conditions. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Pay close attention to the seal status. Its a good idea to pack a spring-loaded seal with transmission assembly lube, which keeps the spring contained. This transmission has lower gear ratios in first and second gears, which brings about improved The valve body is completely redesigned to a greater thickness for strength. The harness protects the wiring. If Most factory AOD Mustangs shift into second gear at a full-throttle RPM of 4,900 (+/- 200 rpm) and roughly 4,500 rpm from second to third. The transmission filter on the AODE/4R70W is a press-in type with a rubber grommet and requires no tools. Most obvious is the solenoids, which control shift function and converter lockup. In part 2 of this series we show the transmission torn While this might not be a bad idea, it could lead to a clearance issue. 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