4T65E Shift Kit 1997-2008, new and ready to install. Fits the 4T65E. Ships fast from the USA.
If your Impala, Monte Carlo, Grand Prix, Century, LeSabre or other 4T65E car keeps setting P1811 for long shifts, chatters on acceleration, or will not grab 4th or lock the converter, this is the kit most shops reach for. It is the TransGo SK 4T65E SHIFT KIT valve body repair kit, the full kit rather than a solenoid set, and it is listed here for 1997-2008 4T65E transaxles. TransGo itself lists it for all 4T65E units from 1997 on, including the TipTronic version used by Volvo and in some Pontiac Grand Prix models.
The 4T65E sets line pressure electronically: the pressure control (EPC) solenoid sends a signal through the torque signal regulator and boost valve to the pressure regulator, and that pressure decides how fast each clutch and band applies. GEARS magazine's P1811 article traces long shifts through exactly that chain. As the factory pressure regulator spring fades and the boost valve wears, line pressure drifts low and inconsistent, shifts stretch out, the computer raises its adapts to compensate, and eventually it sets P1811. The SK 4T65E restores a stable base: it supplies a new pressure regulator spring, a new boost valve, and seven accumulator springs with three spacers that shorten shift time without making shifts rough. Per TransGo, the kit is meant to be paired with a new pressure control solenoid, which is not included.
Check the fluid hot and pull codes. If a solenoid circuit code is stored, the electrical side needs attention first; our pressure control solenoid guide explains how to tell a failed EPC solenoid from a hydraulic problem. A line pressure gauge reading that will not rise as the EPC command increases points to the valve body and its bores. Sonnax notes that a worn AFL valve bore in the channel plate starves every solenoid at once, so on a high-mileage unit inspect that bore too, because no spring kit fixes oil that leaks out before it reaches the solenoid. If the fluid is burnt and the 3-4 clutch is gone, read our 3-4 clutch failure guide; the kit then goes in during the rebuild.
This listing covers 1997-2008 4T65E transaxles, and TransGo's own application is every 4T65E from 1997 on, including TipTronic units. It is not for the earlier 4T60E. Be aware that our other 4T65E 1997-2002 listing is actually a solenoid set, not this valve body kit, so read each listing before ordering. Confirm your transaxle by the case ID tag, or send us your year and VIN to check. All of our parts for this unit are on the 4T65E collection page.
| Fits | 4T65E 1997-2008 |
| 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 the SK 4T65E for every 4T65E from 1997 on, so a later 4T65E is covered by the kit itself. Confirm your car has a 4T65E by the case tag, or send us the year and VIN and we will check it.
No. The kit includes accumulator springs, spacers, a pressure regulator spring and a boost valve. TransGo recommends installing a new pressure control solenoid with it, sold separately.
P1811 is set when shifts take too long. When the cause is a faded regulator spring, a worn boost valve and soft accumulators, this kit is the standard repair. If the cause is a worn AFL bore, a failed EPC solenoid or burnt clutches, those need to be fixed as well.
TransGo designed this kit to shorten shifts without making them rough. Most owners notice crisper, quicker shifts rather than a hard bang.
Yes, it is good practice. If the computer has pushed its adapts high to cover old wear, the first shifts after the repair can be firm until they relearn. A scan tool reset avoids that.
DEXRON-VI, the fluid GM specifies for these transaxles. Check the level hot with the engine running.
