Shop 6T70/6T75 Parts →
The 6T70 and 6T75 are GM's heavy front-wheel-drive six-speeds, developed jointly with Ford (Ford calls its version the 6F50/6F55). You find them behind the 3.0L and 3.6L V6 in the Chevy Traverse, GMC Acadia, Buick Enclave, Equinox and Terrain V6, Malibu, Impala and others. The 6T75 is the higher-torque version; internally they are close relatives and many kits cover both.
The first thing to settle is not the brand. It is the generation. GM made enough changes around the 2013 model year that Gen 1 (roughly 2007-2012) and Gen 2 (2013 and up) kits are not interchangeable. Pistons, some clutch plates and seals differ. Confirm the build from the transmission ID tag before you order.
Pick by Generation and Condition
| Situation | Kit to buy |
|---|---|
| Gen 1 (2007-2012), burnt or slipping | 6T70 Gen 1 master rebuild kit with pistons |
| Gen 2 (2013-up), burnt or slipping | 6T70 Gen 2 master rebuild kit |
| 6T75 application | 6T75 master rebuild kit |
| Clean fluid, leak or broken wave plate caught early | An overhaul-level kit plus the updated wave plate and a new filter |
Master kits include frictions and steels on top of the gaskets and seals. On these units, with the amount of heat they see in heavy crossovers, a master kit is the default. A kit that includes the bonded pistons is worth the extra money on anything over 120,000 miles.
The 3-5-Reverse Wave Plate
The well-known 6T70/6T75 failure is a broken wave plate in the 3-5-reverse clutch pack. When it cracks, the pieces grind through the pack and the vehicle loses reverse, third and fifth, or goes into a failsafe gear. The fragments also circulate through the pump and valve body. We cover symptoms and repair cost in detail in our 6T70/6T75 wave plate failure guide.
For the rebuild, that means three things:
- Make sure the kit or your parts order includes the updated wave plate, not a copy of the original design.
- Inspect the 3-5-reverse housing and the case where the plate lugs ride. Damage there will break the new plate too.
- Clean the valve body and cooler thoroughly. Metal from the old plate hides in both.
What Else to Replace
- Filter and pan gasket. The 6T70/6T75 filter and pan gasket kit (24223670). The filter has a seal pressed into the case; pull the old seal out, it does not always come with the filter.
- Sun shell and hard parts. Check the 6T70 sun shell splines and the drums for heat damage while it is apart.
- Solenoids and the control valve body. The 6T70 uses a control valve body with the TCM and solenoids integrated. Harsh shifts that survive a rebuild are often here. See the 6T70 solenoid kit.
- Sealing rings. Install them with the right tool so they are not stretched. The sealing ring installer kit for 6T40, 6T70 and 6F35 does it cleanly.
Fluid and Relearn
Fill with Dexron VI (or a fluid fully licensed for Dexron VI). These units do not have a traditional dipstick; level is checked at the check plug with the fluid in the specified temperature range, engine running. Overfilled units foam and underfilled units starve the pump. More detail in our 6T70/6T75 fluid guide.
After the rebuild, clear the transmission adaptive values and run the Service Fast Learn with a scan tool that supports it. Without it, a new 6T70 on old adaptives will shift harsh and flare until the TCM relearns, and that can take a long time.
Common Mistakes
- Ordering a Gen 2 kit for a Gen 1 unit, or the reverse, because the listing only said "6T70".
- Rebuilding without addressing the wave plate update.
- Leaving the old filter seal in the case, then pushing a new one in on top of it.
- Skipping the clutch clearance checks and air checks before installing the control valve body.
- Not running Service Fast Learn after the rebuild.
6T70/6T75 Kits Ship Same-Day
Every kit on this page is in stock in our 6T70/6T75 section, along with the solenoids, filters, drums and pumps you find bad once it is torn down. Need a hard part we do not list? Our sister shop CoreTransmissionParts.com carries the deeper hard-parts catalog.
Shop 6T70/6T75 Parts → All Rebuild KitsFAQ
Are 6T70 Gen 1 and Gen 2 rebuild kits the same?
No. GM changed pistons, some clutch plates and seals around 2013. Gen 1 covers roughly 2007-2012 and Gen 2 covers 2013 and up. Confirm with the transmission ID tag before ordering.
What fluid does the 6T70 and 6T75 use?
Dexron VI or a fluid fully licensed for Dexron VI. Level is checked at the check plug at the specified temperature.
Why does the 6T70 lose reverse?
The most common cause is a broken 3-5-reverse clutch wave plate. The rebuild should include the updated plate and a thorough cleaning of the valve body and cooler.
Does a 6T70 need a relearn after a rebuild?
Yes. Clear adaptive values and run Service Fast Learn with a capable scan tool so the TCM learns the new clutch packs.