6T70 Planetary, used and ready to install. Fits the 6T70. Ships fast from the USA.
A 6T70 that whines with road speed, lost a gear, or will not move at all after a wave plate let go usually has a damaged planetary set behind the problem. This is a used OEM 6T70 planetary assembly, shown with its ring gear around the pinion carrier, for Chevrolet Equinox, Malibu, Impala, Traverse, GMC Terrain and Acadia, Buick LaCrosse and Enclave and other GM front-drive and all-wheel-drive models. The listing carries reference AA241 so you can match it to the piece you are replacing.
The 6T70 makes six forward speeds and reverse from three planetary gearsets controlled by five clutches and one one-way diode. Each clutch holds or drives a sun gear, carrier or ring gear, and the set that is locked or freed decides the ratio. That puts the carriers under load in every gear. When a 3-5-Reverse wave plate breaks, which ATRA notes is the most common wave plate to fail in this unit, the pieces circulate through the gear train and damage the pinions and needle bearings. GM also revised the output and reaction carriers for the 2009 model year, machining the sun gear bearing pockets slightly deeper for a heavier bearing, and the updated carriers only backservice an older unit when the updated bearings go with them.
Drop the pan first. Fine gray paste is normal wear, but chunks of steel, broken wave plate segments or loose needle rollers mean the gear train needs a teardown. Spin each pinion and rock it side to side: roughness, flat spots or visible pitting on the teeth means the carrier is done. Our 6T70 Equinox common problems guide covers the wave plate failure that usually starts this damage, and the 6T70 Impala guide explains the codes you are likely to see stored.
This assembly is listed for the 6T70 without a specific model year. The 6T70 is coded MH2 (FWD) or MH4 (AWD) on the glovebox label; the 6T75 (MH6 or MY9) uses a heavier five-pinion carrier and a shot-peened output carrier, so it needs its own part. Because the 2009 carrier update changed the bearing pockets, compare your old carrier, ring gear tooth count and hub spline against the photo and the AA241 reference. Send us your year and VIN before ordering if you want us to check. Every 6T70 part we stock is on the 6T70/6T75 collection page.
| Fits | 6T70 |
| Part type | Planetary |
| Condition | Used |
| Brand | OEM |
| Reference | AA241 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Not reliably. The 6T75 uses a heavier five-pinion carrier and a shot-peened output carrier. Order a 6T75 planetary for a unit with RPO MH6 or MY9.
Check first that the input ring gear and its snap ring were installed on the reaction carrier. They are serviced separately, and a missing ring gear causes exactly that no-drive condition.
Most often a broken 3-5-Reverse wave plate. The fragments travel through the gear train and damage the pinions and bearings, which is why updated wave plates should go in every clutch during the repair.
Yes. GM deepened the carrier sun gear bearing pockets for 2009. Updated carriers work in earlier units only with the updated bearings, so match your old part and send your VIN if unsure.
Dexron VI fluid, checked at operating temperature, followed by a shift adapt relearn with a scan tool.
