6L45 Pump 2006, new and ready to install. Fits the 6L45. Ships fast from the USA.
A 6L45 that hesitates before it picks up Drive on a cold morning, flares between gears once it is hot, or makes a whine that rises and falls with engine speed is often telling you the front pump has lost its edge. This listing is a new GFX pump repair kit for the GM six-speed rear-drive family, industry number K135927A, built for the 13-vane pump design in the .708 in thickness. It is a rebuild kit, not a complete pump: you keep your pump body and stator and replace the parts that actually wear when the pump has been running dirty fluid or chasing a slipping clutch.
The pump bushing, pump seal, slide pivot pin and slide spring are not part of this kit. Budget for them separately if your teardown shows wear.
The 6L45 uses a variable-displacement vane pump in the bellhousing, driven by the converter hub. The rotor spins inside the slide, and the vanes ride out against the slide bore to trap and move fluid. Instead of dumping excess oil through the regulator all the time, the slide pivots to shorten the vanes' stroke when demand is low and swings back out when the transmission calls for volume. That is why a worn slide face, a scuffed rotor or vanes that have lost their square edges show up first as weak line pressure at idle and when hot: the leak paths grow while the pump is turning slowly. Sonnax also points out that the slide pivot pin sits in a high-stress spot and wears under normal use, and GM does not sell that pin and spring separately, so check it while the pump is apart.
Before you buy, put a pressure gauge on the line tap and compare idle and stall readings hot and cold. Our 6L pump failure symptoms guide walks through what low pressure looks like on this family. Also rule out the valve body and solenoids: a sticking line pressure control solenoid can look a lot like a tired pump, and our 6L45 limp mode guide covers how to separate the two. If the converter hub is grooved, read converter hub and pump bushing wear first, because a scored hub will chew through a fresh bushing.
This kit is listed for GM 6L45, 6L50, 6L80E and 6L90 transmissions from 2006 on, in the 13-vane, .708 in configuration. The thickness matters: measure your original rotor and slide before ordering, and match the vane count. BMW GA6L45R units share the pump design but use a bearing in place of the GM pump bushing, so only the bushing step changes. If you are unsure which version you have, send us your year and VIN, or browse the full 6L45 parts collection.
Clean the pump body and stator pocket and check both for scoring before you assemble anything. Install the vane guide rings and rotor with the vanes sliding freely, fit new O-rings to the slide, and confirm the slide pivots without binding. Torque the stator to the pump body evenly and verify the rotor turns smoothly by hand. Prime the pump with Dexron VI before the first start, such as the ACDelco 10-9395 Dexron VI gallon. If the body itself is cracked or the pocket is gouged, a complete 6L45 pump assembly is the better buy, and if the clutches are already burnt, do the job once with a 6L45 master rebuild kit. After the repair, clear adapts and run a relearn so the TCM resets its shift timing to the restored pressure.
| Fits | 6L45 2006 |
| Part type | Pump |
| Condition | New |
| Brand | GM |
| Reference | K135927A |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is a new pump repair kit with the slide, a 13-vane rotor and vanes, guide rings and O-rings. You reuse your pump body and stator.
The kit is listed for the 6L45, 6L50, 6L80E and 6L90 from 2006 on, in the 13-vane, .708 in thickness. Measure your original rotor and slide to confirm the thickness matches.
No. Replace the pump bushing and front seal separately if they are worn. BMW 6L45 units use a bearing in that position instead of a bushing.
Dexron VI. Prime the pump with fresh fluid before the first start and check the level hot with the engine running per the factory procedure.
Yes. Clear the transmission adapts with a capable scan tool and drive the relearn so the TCM adjusts to the restored line pressure.
