6L45 Shift Kit 2006-2018, new and ready to install. Fits the 6L45. Ships fast from the USA.
A 6L45 that hesitates before it drops into Drive, thumps into Reverse, or throws third and fifth ratio codes on a warm day is very often leaking pressure inside its own hydraulics. The kit sold on this page is the TransGo SK 6L80, which TransGo calls a Shift Kit Valve Body Repair Kit. Despite the 6L80 in the name, TransGo builds it for the whole GM six-speed rear-drive family, 6L45 (RPO MYA) included, and this listing covers 2006-2018 units. It is new, made in the USA and ships from the USA. Think of it as a restore kit for worn bores, not a hard-shift race calibration.
The 6L45 is the light-duty member of the family, found behind smaller engines in BMW cars (where it is called the GA6L45R) and in some Cadillac applications; Transmission Digest documents it in the 2010 CTS AWD 3.0L. It shifts clutch-to-clutch under TEHCM control, so every apply depends on a stable line pressure and a stable regulated supply to the solenoids. Two bores wear and upset both. The pressure regulator valve in the pump delaminates and wears its bore, and the solenoid regulator valve bore in the upper valve body wears too. TransGo answers the first with a hardened, precision-ground steel PR valve with longer lands, a new RED spring and a boost valve and bushing that carries a built-in EPC relief ball. The second gets a new steel solenoid regulator valve that rides in its own bushing, so the worn original bore no longer matters. No reaming or special tools are needed.
The box also holds five pressure switch diaphragms and five seals for the TEHCM pressure switches, and three high-temperature stator sealing rings with expander wires.
Every one of those codes can also come from a bad solenoid, worn clutches or a TEHCM fault, so test before you buy.
Read codes and freeze-frame first, then put a gauge on the line pressure port and compare it with the commanded pressure on a scan tool. Sonnax notes that a flat reading in the 60-68 psi range points to a line pressure solenoid stuck in exhaust, which is an electrical or solenoid fix, not this kit. Pressure that wanders or drops when hot, with good solenoids, is the worn-bore picture this kit is built for. Our 6L45 limp mode guide covers the full test sequence, and the delayed engagement guide walks through the engagement complaint specifically.
This listing is for the 6L45 from 2006 through 2018. TransGo rates the SK 6L80 for 2006-on 6L45, 6L50, 6L80 and 6L90, and the instruction sheet lists 2006-2020. Valve bodies are not interchangeable across the family (GM bulletin 16-NA-130 shows upper valve bodies are unique by RPO), but this kit replaces valves inside your own pump and valve body, so it fits all four. The stator rings only fit steel ring grooves without locking notches; units with locking-type rings reuse the originals. If you are unsure which unit you have, send us the year and VIN before ordering. More 6L45 parts are in the 6L45 collection.
| Fits | 6L45 2006-2018 |
| Part type | Shift Kit |
| Condition | New |
| Brand | GM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
TransGo builds one SK 6L80 kit for the whole family. Its application line reads 2006-on 6L45, 6L50, 6L80 and 6L90 because the pump PR valve and solenoid regulator valve are common across them.
No. It restores correct line pressure control in worn bores. It is not the firm-shift towing calibration TransGo sells separately.
Only part of it. The solenoid regulator valve is in the upper valve body, but the PR valve and boost valve are in the pump, so the full kit needs the transmission out.
Sometimes. Those codes are on TransGo's list because pressure leaks can set them, but a failed solenoid or TEHCM sets them too. Test pressure against command first.
Dexron VI, filled and checked at temperature by GM's procedure. Clear adapts and run a fast learn or drive relearn after the repair.
Only on steel stator ring grooves without locking notches. Do not use them on aluminum ring grooves or locking-type stators.
