4L70E Shift Kit 1993-2014, new and ready to install. Fits the 4L70E. Ships fast from the USA.
This is the TransGo SK 4L60E valve body repair kit, sold through many parts distributors as T74165E, covering the GM 4L60E, 4L65E, 4L70E and 4L75 from 1993 through 2014. For a 4L70E owner that means the heavier-duty four-speed in a 2006-2013 Silverado, Sierra, Tahoe, Yukon or Trailblazer SS that has started to shudder at cruise, slam the 1-2 upshift, flare on the 2-3, or eat 3-4 clutches. It is new, built in the United States, and does not fit hybrid versions of the transmission.
The 4L70E is a strengthened 4L65E, but the valve body, pump and accumulator layout are the same family design, so it inherits the same weak hydraulics. TransGo traces the most common complaint to the torque converter clutch regulator valve bore, which wears until the converter clutch slips. The computer sees that slip, logs P1870 or P0894, and commands high line pressure to protect the converter, which is why so many trucks show up with a harsh 1-2 shift as well. The other half of the story is the shift accumulation system: uneven pressure boost and a soft accumulator calibration let the 3-4 clutch slip as it applies.
The kit attacks both. It drops in a USA-made hardened steel TCC regulator and isolator valve with longer lands that run on unworn sections of the bore, with spring options for trucks with or without Active Fuel Management. Five 1-2 accumulator springs, two second servo springs, pressure regulator springs, an actuator feed limit spring, 3-2 control and low control springs, an EPC screen and an oversized 1-2 checkball recalibrate the rest, along with a slight line pressure increase.
Scan for codes and watch TCC slip speed in fourth at steady cruise. A slip code with a healthy converter usually points at the regulator bore this kit fixes. Rule out the pressure control solenoid with an amperage check, because a lazy EPC solenoid produces many of the same shift complaints; our EPC solenoid guide shows the numbers to look for. If you are already into flare and slip, read the 4L70E valve body testing guide to separate valve body wear from clutch damage.
Listed for 1993-2014 4L60E, 4L65E, 4L70E and 4L75 automatics, excluding hybrids. The 4L70E itself appeared in 2006 trucks and SUVs, so on this page the earlier years apply to the 4L60E and 4L65E. Distributor equivalents include K77908A, K51944E and TG-SK 4L60E, so you can cross-check against a part number from a parts counter. Valve body castings and TCC strategies changed through these years; if you are unsure which spring option your truck needs, send us the year and VIN. More parts for this unit are in the 4L70E collection.
The valve body work can be done with the transmission in the vehicle by dropping the pan, but the pump and reverse input piston modifications are best done on the bench during a rebuild. Follow TransGo's installation sheet step by step and keep removed springs and valves in order on a tray. Use DEXRON-VI, the fluid GM specifies for the 4L70E, and check the level hot. If the converter has been slipping for a long time, consider a new pressure control solenoid while the valve body is down, and if the 3-4 pack is already burnt, replace the clutch drum parts as well.
| Fits | 4L70E 1993-2014 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Reference | T74165 |
| Ships | From the USA |
| Warranty | 1-year |
It is listed for the 4L75 along with the 4L60E, 4L65E and 4L70E from 1993-2014. It does not fit any hybrid version of the 4L60E family.
Yes. T74165E is a distributor number for the TransGo SK 4L60E kit, as are K77908A, K51944E and TG-SK 4L60E.
The kit includes TCC regulator valve component options for vehicles with and without AFM. Use the setup the instructions call for on your truck.
Not for the valve body portion, which can be done through the pan. The pump and reverse input piston changes require disassembly and are best done during a rebuild.
DEXRON-VI, the fluid GM specifies for the 4L70E. Set the level hot with the engine running on level ground.
