4R70W Shift Kit, new and ready to install. Fits the 4R70W. Ships fast from the USA.
Most people shopping for a 4R70W shift kit drive an F-150, Expedition, Mustang or Crown Victoria that has started to flare between gears, bang on a hard downshift, or burn through a rebuild faster than it should. This TransGo kit goes into the valve body and fixes the hydraulic habits behind those failures. It is not tied to a single model year: the instructions branch by plate type and duty rating, so one kit covers the passenger car, the tow truck and the police car with different drill sizes.
The 4R70W applies its clutches and bands with line pressure set by the EPC solenoid and the pressure regulator valve, and the timing of each shift is softened by accumulators. As those valves wear and the accumulator springs fatigue, shifts stretch out and the friction slips longer on every change. The kit puts in a no-stick solenoid regulator valve, a drop-in pressure regulator valve and upgraded accumulator springs, then resizes orifices in the separator plate so apply rates match the vehicle. It also adds an EPC relief system that limits runaway pressure if the electronics fail.
A sticking shift solenoid, a bad connector or an EPC fault feels a lot like worn hydraulics, so scan for codes and test the solenoids before you open the pan. Our 4R70W harsh shift causes guide separates pressure faults from electrical ones, and the F-150 shift problems guide covers what fails most on trucks. If the electrical tests pass and the shifts are still soft or flaring, the valve body is the place to work.
TransGo catalogs this kit for the AODE, 4R70W/E and 4R75W/E from 1991 on. Before you drill, identify your separator plate: the instructions use different hole sizes depending on whether the plate has hole 4, and again for passenger, police, taxi or heavy-duty use. Check whether your 2nd accumulator piston is aluminum or steel, and whether your stator support uses metal or the factory plastic seal rings found from 2004 up. If any of that is unclear, send us your year, model and VIN before ordering. You can browse the full range in our 4R70W parts collection.
If the 2nd gear roller clutch let go during a kickdown, replace it with the 4R70W sprag clutch while the unit is apart.
| Fits | 4R70W |
| 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.
TransGo lists it for AODE, 4R70W/E and 4R75W/E from 1991 on. The instructions change hole sizes and a few springs by plate type and year, so identify your separator plate first.
Yes. The instructions have separate, larger orifice sizes for heavy-duty, police and taxi use, which firm the apply for loaded trucks.
It fixes the pressure and timing problems that cause slip, but it cannot restore burnt clutches or bands. If the friction is damaged, rebuild the unit and install the kit at the same time.
Basic hand tools, a drill and the bits supplied with the kit. Some steps such as the forward clutch rings need the transmission out and apart.
Clearing adaptive memory with a scan tool or battery disconnect and driving several normal shift cycles lets the computer settle on the new hydraulics.
