4L70E Shift Kit 1993-2015, new and ready to install. Fits the 4L70E. Ships fast from the USA.
This is the TransGo SK 4L60E SHIFT KIT, the valve body repair kit transmission shops have been building into GM four-speeds for decades. TransGo lists it for 1993 through 2015 4L60E, 4L65E and 4L70E automatics, which covers the 4L70E in 2006-2013 Silverado, Sierra, Tahoe, Yukon and Trailblazer SS applications. If you are fighting converter shudder, a P1870 or P0894 code, a harsh 1-2, a 2-3 that flares, or a rebuilt unit that keeps cooking its 3-4 clutches, this is the kit aimed at those exact complaints. It is new, and it does not fit hybrid models.
The 4L70E shares its hydraulic layout with the 4L60E and 4L65E, and so it shares their weak spots. TransGo explains the chain of events: the TCC regulator valve bore wears, the converter clutch starts to slip, and the computer answers slip by commanding high line pressure, which is why a slipping converter so often shows up as a harsh 1-2 upshift. Separately, uneven pressure boost and a soft accumulator calibration let the 3-4 clutch slip on apply, which is how 2-3 flares and burnt 3-4 plates happen.
The SK 4L60E works on both problems. It replaces the TCC isolator and regulator valve with a hardened, longer-land valve that rides in unworn sections of the bore, with spring options for trucks with and without Active Fuel Management. It recalibrates the 1-2 and 3-4 accumulators, adds second servo springs, a new pressure regulator spring set, an actuator feed limit spring, an EPC screen and a slight line pressure increase. The goal is firm, consistent shifts that last, not a harsh street-rod feel.
A shift kit corrects calibration and worn TCC hardware; it cannot bring back clutches that are already burnt. If 3rd and 4th are gone or the pan holds friction material, plan a rebuild and install this kit during it. Before blaming hydraulics, check the pressure control solenoid, because a weak EPC solenoid produces many of the same shift complaints. Our 4L70E EPC solenoid guide shows how to read commanded amps first, and the 4L70E valve body testing guide covers bore wear that needs reaming or oversize valves beyond what this kit includes.
TransGo rates the SK 4L60E for 1993-2015 GM 4L60E, 4L65E and 4L70E units, except hybrids. The kit includes alternate parts for different years and for AFM or non-AFM trucks, so read the instruction sheet before you start and use the parts that match your transmission. The pump and valve body still vary by year, so compare your castings to the instructions or send us your year and VIN if you are unsure. Every part we stock for this family is on the 4L70E parts page.
TransGo says the transmission does not have to come out for the valve body work, though the pump and accumulator steps are easiest on the bench during a rebuild. The kit includes drill bits and a drilling sequence; follow the sheet step by step, keep each removed spring and valve in order, and do not mix the AFM and non-AFM TCC parts. If you are already inside the unit, a fresh pressure control solenoid gives the new calibration a clean signal to work with, and for more 2nd gear holding power TransGo pairs its kits with a Corvette servo kit. Refill with DEXRON-VI, check the level hot on a level surface, and drive gently for the first few hundred miles while the computer adapts. If you are chasing repeat clutch damage, read our 3-4 clutch failure guide before you button it up.
| Fits | 4L70E 1993-2015 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Yes. TransGo lists this kit for 1993-2015 GM 4L60E, 4L65E and 4L70E transmissions. It does not fit hybrid models.
Those codes usually point to TCC slip from a worn TCC regulator valve bore. The kit replaces that valve with a longer-land hardened valve that runs in unworn bore, which TransGo says corrects the slip. Check the converter itself and the EPC solenoid too if the code returns.
Not for the valve body portion. The pump and accumulator modifications are best done on the bench during a rebuild.
No. This is a repair calibration with a slight line pressure increase, aimed at firm, consistent shifts that last rather than a race-style bang.
DEXRON-VI, which GM specifies for the 4L70E. Check the level hot with the engine running on a level surface.
