4R70W Shift Kit 1991, new and ready to install. Fits the 4R70W. Ships fast from the USA.
The 1991 in this title is the start of the application, not a one-year part. TransGo builds this shift kit for the Ford AODE valve body family, and its coverage begins in 1991 and runs forward through the 4R70W and 4R75W. That makes it the kit owners of early Crown Victoria, Grand Marquis, Town Car, F-150 and Mustang automatics reach for when the transmission comes apart with a burnt overdrive band, a cooked forward clutch, or a broken roller clutch after a hard kickdown. If you are rebuilding an early electronic unit, this is the valve body side of that job.
TransGo is blunt about this transmission: the main complaint is not shift feel, it is friction life and broken parts. When you floor it at highway speed and the unit drops from fourth to second, the engine and converter can flare before second gear grabs, and that sudden load slams the intermediate roller clutch and the shafts. The kit reshapes that event so a 55-70 mph kickdown passes through third on the way to second and finishes before the engine runs away. It also seals the forward clutch circuit better, adds an EPC relief system for uncontrolled line pressure, and replaces the solenoid regulator and pressure regulator valves that wear in their bores.
Rule out the electrical side first. Codes like P0751 or P0756 can be a failed solenoid or a damaged case connector rather than a hydraulic fault, and early 1993-1997 4R70W units use a white soft-wired connector that differs from the later black hard-wire frame. Our 4R70W shift solenoid symptoms guide walks through the resistance checks, and the Crown Victoria shift problems guide covers the early-car failures most likely to send you here. If the wiring checks out and you still have flare, slip or burnt friction, the kit belongs in the rebuild.
TransGo catalogs this kit for the AODE, 4R70W/E and 4R75W/E from 1991 on. Early units carry details the kit treats differently: the furnished forward clutch seal rings fit 1991-2003 stator supports, and 1991-1995 valve bodies take the new orange lockup spring while 1996-up keep the original. Valve body and separator plate layouts also changed over the years, so check the instructions against your parts before drilling anything. If you are unsure which unit you have, send your year, model and VIN and we will confirm it. Every other part for this family is in the 4R70W parts collection.
If the band and clutches are already burnt, do the job once with the 4R70W master rebuild kit, and replace a broken roller or damaged gear set with the 1993-2002 4R70W planetary.
| Fits | 4R70W 1991 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. 1991 is where TransGo's coverage starts. The same kit is catalogued for the AODE, 4R70W/E and 4R75W/E from 1991 on, with year-specific steps in the instructions.
The valve body work can be done in the vehicle, but the forward clutch seal rings and the overdrive band reshape need the transmission apart. TransGo also warns that pulling the OD servo in the car can cost you fourth gear if the band shifts.
The goal is crisp, cushioned shifts and fewer broken parts, not harsh street-racer shifts. Kickdowns will feel different because the 4-2 is staged through third.
Any burnt band or clutch pack, the aluminum 2nd accumulator piston if yours has one, and a worn OD servo bore. A master rebuild kit covers the friction side.
MERCON V. Check the level hot with the engine running in park and keep it no more than a quarter inch above the crosshatch.
