Bushing driver and installer set for the GM 6L80 and 6L90 six-speed, 2006-up. Removes and seats case, pump and shaft bushings to proper depth.
If your shop drawer is full of 4L60E and 4L80E bushing tools and you just opened up your first GM 6L80, you have probably found out they do not line up with this transmission. This set is made for the six-speed 6L80 and 6L90 used from 2006 on in Chevrolet, GMC, Cadillac and Hummer trucks and SUVs and in the Camaro and Corvette. It is a replacement for the 104BDMK 6L80 bushing tool and handles both jobs: driving worn bushings out of the case and pump, and seating new ones straight and to depth.
A bushing in this transmission is more than a spacer for a spinning shaft. The clearance between bushing and journal sets the oil film that carries the load, and on circuits that pass through rotating shafts that clearance is part of the seal. Two of the bushings that take the most abuse are the pump bushing, which supports the converter hub, and the case bushing. In the Sonnax replacement kit both are PTFE-impregnated bimetal: the pump bushing fits a 1.994 inch bore over a 1.834 inch hub, and the case bushing a 2.199 inch bore over a 2.062 inch shaft. The output shaft bushing is a 1.562 inch bore over a 1.429 inch journal. Those are big, thin bushings. Pushing them out with a punch can scar the bore, and pushing new ones in with the wrong tool can buckle the wall, which is why a set sized for these exact bores matters on the removal side as much as the install side.
Run the pressure test first. Gears Magazine's 6L80 article describes checking mainline pressure at the test port against the EPC pressure the TCM is commanding; a unit that falls short has a pump or a leak problem. Our 6L80 pump failure symptoms guide covers the pump side. If the problem is a harsh or odd shift, check the adapt and solenoid steps in the 6L80 Camaro shift problems guide before you pull the unit, since a reset fixes some complaints. With the case apart, measure each journal with a micrometer and each installed bushing with a bore gauge; the difference is running clearance. Replace any bushing that is over your rebuild manual's limit, scored, spun or loose.
Fits the GM 6L80 and 6L90 six-speed automatics, 2006 and up. It is for the six-speed only: it does not share sizes with the 4L60E, 4L80E or other older GM units, and it is not listed for the smaller 6L45 or 6L50. It replaces 104BDMK and the 6L80 bushing tool. Shipping weight is about 6.9 lb. No bushings are included. Confirm your unit by the RPO code on the vehicle's service parts label (MYC for 6L80, MYD for 6L90) or send us your year and VIN. Matching parts for the rest of the job are on our 6L80 parts collection.
Before removal, mark each bushing's depth and the clock position of any oil hole. Drive or pull the old bushing out from the side it was installed from, supporting the housing so it does not crack. Clean the bore and lightly dress it if it has burrs. Sonnax's bushing article recommends prepping the shaft journal with fine emery cloth by hand, keeping it light so no material comes off, and blowing out every lube hole afterward. Lube the new bushing, align its oil hole, and press it in square with the matching installer until it reaches the marked depth. Since the pump bushing supports the converter hub, a worn pump body is often replaced as an assembly; see the 6L80 pump. Put the unit back together with a fresh 6L80E/6L90E overhaul seal and gasket kit and Dexron VI fluid, then reset adapts.
| Fits | GM 6L80, 6L90 (2006-up), 6-speed only |
| Replaces | 104BDMK, 6L80 bushing tool |
| Shipping weight | About 6.9 lb |
Usually not. The 6L80 does not share bushing sizes with those older units, which is why this set is sized for the six-speed bores.
It is a driver and installer set, so it is used both to drive the worn bushings out of the case and pump and to seat the new ones.
Measure the shaft journal with a micrometer and the installed bushing with a bore gauge. The difference is running clearance; compare it to the limit in your rebuild manual and replace anything over spec.
Yes. Sonnax lists excess converter hub-to-bushing clearance and pump noise among the conditions its replacement 6L80 pump bushing addresses.
No. This set is listed for the 6L80 and 6L90 six-speed only.
