Drives the six 6L80/6L90 case and drum bushings to the correct depth on GM 6-speeds so a rebuilt unit seals square without egging the bore.
Rebuilding a 6L80 or 6L90 out of a 2006-up Silverado, Sierra, Tahoe, Yukon, Escalade or Camaro means replacing a lot of bushings: the pump, stator support, case, center support, drum and hub bushings all wear, and on a high-mileage unit several are usually scored or walked out of position. This 9-piece set is seven hardened stepped drivers and two knurled handles sized for the 6L80/6L90 bores, so each new bushing goes in straight and stops where it should instead of being tapped in with whatever socket fits.
Each bushing in the 6L80 is a thin steel-backed bearing with tight clearance to its shaft. That clearance is also an oil seal: the 6L80 feeds clutch circuits through rotating shafts and the stator support, and a worn or cocked bushing lets pressure bleed away. A driver pilots in the bore, shoulders on the bushing face and pushes evenly around the whole circumference. Sonnax, which sells the 6L80/6L90 bushing kit 104030A-01K, warns that driving bushings with a hammer can distort them and says an arbor press is required. These drivers are made to be run under an arbor press, which is how we recommend using them.
Check line pressure against commanded pressure before blaming hard parts; low pressure on a 6L80 is often the pump or stator area, which our 6L80 pump failure symptoms guide covers. During teardown, measure each shaft journal and bushing bore and compare clearance to the rebuild manual. Any bushing over spec, scored or loose in its bore gets replaced, and once you are into the unit most rebuilders replace them all. For the failures that bring a 6L80 onto the bench in the first place, see 6L80 common problems and fixes.
Listed for the GM 6L80 and 6L90 six-speed automatics, 2006-up, in 2WD, 4WD and AWD Chevrolet, GMC, Cadillac, Hummer, Pontiac and Holden applications; bushing locations do not change with drive type. It cross-references the 104bdmk / 6L80 service tool. It is not for the 6T70 or 6T75 front-wheel-drive transaxles or other GM families. Bushings are not included. If you are sourcing the rest of the rebuild, our 6L80 parts page lists everything we carry for this unit.
Remove old bushings with a puller or by collapsing them, never by gouging the bore. Clean every bore, note the original bushing depth and any oil-hole position before removal, and line up oil holes on install. Pick the driver whose pilot fits the bore snugly, set the bushing on it, and press slowly and straight until the shoulder seats. Check the new bushing with a bore gauge, lubricate it with Dexron VI or assembly lube, and test-fit the shaft so it turns freely. Pair the drivers with a full 6L80/6L90 master rebuild kit, and replace the 6L80 pump if the stator support or gears are worn.
| Fits | GM 6L80 / 6L90 6-speed, 2006-up (Chevy, GMC, Cadillac, Hummer, Pontiac, Holden) |
| Pieces | 9-piece: 7 bushing drivers, 2 driver handles |
| Material | Hardened solid steel, black oxide finish |
| OE reference | 104bdmk / 6L80-Tool |
| Drive types | 2WD, 4WD, AWD, RWD |
| Weight | 7.02 lb |
No. It is tools only, nine pieces: seven drivers and two handles. Buy a 6L80/6L90 bushing kit or the bushings in your rebuild kit separately.
We recommend an arbor press. Sonnax warns that hammering bushings in can distort them, and steady press force keeps the bushing round and square in the bore.
Yes. It is listed for both the 6L80 and 6L90 in 2WD, 4WD and AWD versions. It is not for the 6T70 or 6T75 transaxles.
Measure all of them. Pump, stator support, case, center support, drum, hub and output shaft bushings commonly wear, and most rebuilders replace every one once the unit is apart.
Note where the old one sat before removal, use the driver that pilots in the bore, and press until it seats. Then verify clearance with a bore gauge and confirm the shaft turns freely.
