6T75 Overhaul Kit 2013-2020

If your 2013-2020 Chevrolet Traverse, GMC Acadia or Buick Enclave has the heavy-duty 6T75 and the transmission is coming apart, whether for a leak you can no longer live with, a slip that started after towing, or a reverse that takes a long pause to engage, this is the gasket and seal set that goes back in it. The kit pictured is a boxed aftermarket overhaul set with the large pan gasket on top, made for the later 6T75. It is not a clutch kit; it is the sealing side of the job, the part that has to be new any time the case halves, side cover and pump are separated.

What the overhaul kit does in a 6T75

The 6T75 is the stronger sibling of the 6T70. ATRA rates it at 299 lb-ft of engine torque and 4,500 lb of towing, against 280 lb-ft and 1,000 lb for the 6T70, and it gets heavier internal parts to match. What it does not change is how the unit works: it is a clutch-to-clutch transaxle with no shift valves and one accumulator, so every shift is two clutches trading pressure under computer control. That only works if every apply circuit holds pressure. The piston seals, sealing rings, case and cover gaskets and O-rings in an overhaul kit are what keep oil going where the TEHCM sends it instead of bleeding past a hardened lip. On a 6T75 that has towed a trailer for years, those seals have been cooked repeatedly, and a fresh set is the baseline for any rebuild.

Symptoms that point to a reseal or rebuild

• ATF seeping from the side cover, case halves or axle seal area, with the level dropping between checks.
• Delayed engagement into Drive or Reverse on a cold start that improves once warm, a classic hardened-seal sign.
• Slipping or flare under load once the fluid is hot, especially after towing.
• No reverse, 3rd or 5th with P0776. The 3-5-Reverse wave plate failure lets the piston over-stroke and leak; the fix needs new seals plus the updated hard parts.
• Shudder or flare on the 2-3 or 3-2 shift. GM bulletin 18-NA-358 covers this on 2014-2019 units with RPO M7V or M7X, the 6T75 codes, and traces it to valve body debris.

How to confirm before you buy

Scan for codes and record the RPO codes from the glovebox label. Check the fluid hot and look for clutch material on the pan magnet. A clean pan with a cold-only delay leans toward seals; heavy debris means you also need frictions and steels. Our Acadia shift problems guide walks through separating a shudder or harsh shift from a hard-parts failure, and the 6T70/6T75 common problems guide covers the wave plate and pressure switch failures in detail.

Fitment

This listing is for 2013-2020 6T75 transmissions. Be careful with 2013 and early 2014. ATRA's update notes say the 6T75 with RPO M7V or M7X got the Gen 2 controls update for 2013, but other RPO codes stayed Gen 1 until 2014 production, and Transmission Digest confirms all 2014-later units should be Gen 2. A Gen 1 unit needs the 2007-2012 6T75 overhaul kit instead. A late Acadia can carry either a 6T70 or a 6T75, so do not go by model name. Match the RPO codes, or send us your year and VIN and we will check it. The full parts range is on the 6T70/6T75 collection page.

Install notes

• Soak every rubber seal in DEXRON-VI before assembly and lube sealing rings with assembly gel so they do not roll or cut.
• Air-check each clutch circuit before the case is closed; a leaking piston is far easier to find on the bench.
• Transmission Digest documents Gen 1 pistons found in Gen 2 units causing slips and delays in first, so confirm the piston generation as you go.
• The side cover gasket is not reusable, and ATRA says the side cover studs must be re-torqued after the cooler lines come off.
• Lift the converter in and out vertically; its turbine shaft lip seal lives inside the converter.
• Replace the internal filter, refill with DEXRON-VI, then run Service Fast Learn Adapts and let the TCM power down.
• If the pan showed wear metal, pair the kit with a 2013-up 6T75 pump, or step up to the 6T75 master rebuild kit that adds frictions and steels.

Does this 6T75 overhaul kit include clutch plates?

No. It is the gasket and seal set: gaskets, piston seals, sealing rings and O-rings. If your frictions are burned or the pan is full of clutch material, use the 6T75 master rebuild kit, which adds frictions and steels.

Will it fit my 2013 Traverse or Acadia?

Only if the transmission is a Gen 2 6T75. In 2013 the update went to RPO M7V and M7X; other 2013 and some early 2014 units were still Gen 1. Check the RPO label or send us your VIN before ordering.

Is a 6T75 kit the same as a 6T70 kit?

They share the layout but the 6T75 is the heavy-duty version with different internal parts. Order by the transmission RPO code, not by the vehicle name, because some late Acadias used either unit.

What fluid does the 6T75 use after a reseal?

DEXRON-VI only. Check the level hot after the relearn drive, since the unit is filled and checked at operating temperature.

Do I need to relearn shifts after installing it?

Yes. Run Service Fast Learn Adapts with a scan tool, shut the engine off and let the TCM power down. Skipping it is a common reason a fresh rebuild shifts harsh.

• 6T70 Acadia Shift Problems: Diagnosis and Fix
• 6T70 Common Problems and Fixes
• 6T70 Acadia Common Problems and Fixes
• 6T70 Equinox Shift Problems: Diagnosis and Fix