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Updates to the Transmission

  • Updated Spiral Snap Ring Retainer:
    Vehicles equipped with this transmission often experience premature failure of the intermediate roller clutch or mechanical diode during high-rpm conditions. Sonnax spiral retaining ring kit incorporates a spiral snap ring that is staked to a locking ring to ensure ring contact with groove during high-rpm conditions, eliminating blowout.
    Wrap-around design maintains contact with groove bottom, Locking ring prevents spiral retaining ring expansion during high RPM
  • Updated Sonnax Overdrive Pin:
    Vehicles equipped with this transmission one of the common problems are intermediate roller clutch, overdrive band or forward clutch failure, traced to the O.D. servo pin wearing the case bore. The oil circuit which releases or holds the servo off is present as forward clutch oil in 1, 2, 3 ranges. If this release oil leaks through the case, it can cause the O.D. band to drag and/or forward clutches to overheat. If band overheating becomes extensive, it may not hold in 4th gear, which can allow a neutral condition and excessive roller RPM on a re-engagement of 4-2 downshift. The Sonnax Overdrive Servo Pin has two O-rings to positively seal against the piston I.D. and the case bore, eliminating oil circuit leaks.
  • Updated Sonnax Main Pressure Regulator Valve:
    Common issues with the 4R70/4R75 Transmission is a worn pressure regulator valve resulting in erratic line pressure, poor line rise. This can result in harsh or soft shifts and band/clutch failure as well as other drive ability concerns. Installing Sonnax main pressure regulator valve restores normal line pressure operation in all ranges. These closely toleranced parts are made from high-quality aluminum and have been specially hard-coated to eliminate excessive wear. Annular grooves have been added to the pressure regulator valve to allow an oil film to surround the valve, thus centering it in the bore to prevent side loading which causes premature wear.
Year Make Model Engine
Year Make Model Engine
1993 Mercury Cougar 3.8L
1994 Ford Mustang 3.8L
1994 Ford Thunderbird 3.8L
1994 Mercury Cougar 3.8L

This transmission comes with a 1 Year 36,000 Mile Warranty with the purchase of a new torque converter. We offer an extended Warranty 2 Year 50,000 Mile Warranty, or a 3 Year 100,000 Mile Warranty for an additional charge.

Any and all shipping costs, including freight damage claims. Rental cars, loss of work, any labor costs, removal/reinstall fees, towing costs, inspection fees and any other incidental costs or damages which may be associated with product failure. Any product that has been physically altered, improperly installed or maintained. Any product used in an improper application, abused or not used in connection with the proper parts.

Buyer is required to pay the core deposit up front. Core must NOT have any internal hard part, or case damage, otherwise there will be additional charges deducted from your core deposit for the damaged hard part(s) or case. Initial shipping cost only covers one-way shipping. Return shipping cost for the transmission core is not included. Return shipping cost is deducted from your core deposit refund, after returned core passes inspection.

Majority of units are in stock, in the unlikely case we do not have one in stock, they are quickly available, in most cases, as little as one business day. There are many different variations of this transmission model available so please make sure we get a VIN number when or after you place the order.

4R70W 1994 2WD TRANSMISSION 3.8L

Our Process:
All of our transmissions are fully remanufactured and are held to the highest and strictest industry standards. What this means to you is the fact you are getting a quality product that meets or exceeds the OEM standards, not just a part that is taken apart and “patched”. We ensure that all the current updates are performed, during reassembly each unit is ran through tests to ensure correct assembly and quality

Our Process:All of our transmissions are fully remanufactured and are held to the highest and strictest industry standards. What this means to you is the fact you are getting a quality product that meets or exceeds the OEM standards, not just a part that is taken apart and “patched”. We ensure that all the current updates are performed, during reassembly each unit is ran through tests to ensure correct assembly and quality.
Parts List:
TransTec Overhaul Kit – Rubber Seals, Metal Clad Seals, Sealing Rings, Paper Gaskets
Master Rebuild Kit with all clutches and steels, name brand clutches such as Borg Warner or Raybestos
Filtran Brand Transmission Filter
Borg Warner Reverse & Overdrive Bands
Bonded Reverse & Overdrive Servos
Bonded 1/2 & 2/3 Accumulators/ Covers
Borg Warner or Raybestos Overdrive and Reverse Bands
Pump Bushing
Pump Gears
Updated Sonnax Pressure Regulator Valve
Updated Sonnax Intermediate Spiral Sprag Snap Ring
Updated Sonnax Overdrive pin
Updated Superior Heavy Duty Separator Plate

Have a Questions?
(815) 935-2356
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What Our Customers Say

Don't just take our word for it. Hear from fellow DIYers and mechanics who've experienced the Shift Rite difference. Our customers consistently praise our quality products, expert advice, and outstanding service. See why so many trust us for their transmission needs.
Christian Davis
I purchased a 48RE Transmission from ShiftRite! It arrived quickly, installed it, and I was back on the road! So far all is well! The communication was outstanding and the people at ShiftRite really take care of their customers! Thanks!
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Lisa Sewell
As a first time customer, I was extremely pleased with how efficient and professional this company is. I had the pleasure of dealing with Molly who was very knowledgeable and pleasant. Molly was timely with returning calls/text messages. She is a great asset to the company. I would highly recommend their services if needed. Lisa Sewell
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John Parks
If you have any doubt about purchasing your transmission from Shiftrite put it to the side . I can promise you they stand on their work because it’s top shelf and the small chance they do make a mistake they will rectify it I assure you . In my case the mistake was on my end Bret still helped me resolve the problem . Thanks again Bret and the team at ShiftRite . I appreciate it !
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Raymond Noblin
The owner was very involved with my 4l80e swap. Had an internal harness connector o-ring leak they helped me resolve to prevent fluid from leaching up into the main input harness. After that the trans performed flawlessly. Great communications and shipping crate professionally done. I will use them again I am sure. I would proudly wear a shirt or hat with their logo. Thanks team.
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Ginger Duke
Needed a transmission for my dodge 5500. They shipped it quickly to my mechanic then let me bring the core in since I was going to be in the area, so I didn’t have to spend a bunch on shipping to get my core deposit back! Molly is the best to deal with! Can’t go wrong with them!
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