6T75 Shift Kit, new and ready to install. Fits the 6T75. Ships fast from the USA.
A Traverse, Acadia or Enclave that tows, or simply hauls seven people, puts the 6T75 valve body under more heat than the lighter 6T70 ever sees. Over time that shows up as a 3-4 flare, a shudder on the 2-3 upshift, a converter clutch that slips on the highway, or new clutches that burn up within months of a rebuild. This new Sonnax shift kit for the 6T75 is aimed at those wear points. The kit in the photo is the Sonnax Zip Kit set for the Gen 2 valve body, and its job is to bring a tired valve body back to factory pressure control rather than make the shifts feel hard.
GM made the 6T75 the heavy-duty member of the family. ATRA's introduction to the unit gives it a 4,500 lb tow rating against 1,000 lb for the 6T70, using a stronger output carrier, five-pinion carrier, wider transfer gear and ribbed case. The valve body is the same clutch-to-clutch design, though. Solenoids send signals to regulator valves, the valves set apply pressure for each of the five clutches, and the module adjusts fill times as parts wear. Once a valve bore wears or a plug leaks, the module runs out of adjustment, and under a trailer the clutch that is slipping cooks first. Sonnax's booklet for this kit links each part it replaces to a specific complaint:
Start with what costs nothing. GM's PIP5363B shows that a harsh light-throttle 1-2 shift with no codes on 2015-2017 Acadia, Enclave and Traverse is usually unlearned shift adapts, fixed with a drive learn. Check the fluid level hot and read freeze-frame data for any code. If the complaint survives a relearn, our 6T70 and 6T75 Traverse shift problems guide and the Acadia shift problems guide lay out which symptoms belong to the valve body and which belong to the clutches.
This listing names the 6T75 with no year, and generation is what matters. On a Gen 2 valve body the TEHCM has no pressure switches, there are six solenoid dampers, and the lower body carries an added checkball. Gen 2 parts started in 2013, and Gen 2 valve bodies use separator plates that do not interchange with Gen 1. A 6T75 with pressure switches is Gen 1 and takes the 6T75 shift kit for 2007-2012. Look for RPO MH6 or MY9 on early units; later Lambda crossovers carry newer codes such as M7V and M7X. Send your year and VIN if you want us to confirm. The full parts range is on the 6T70/6T75 collection page.
| Fits | 6T75 |
| Part type | Shift Kit |
| Condition | New |
| Brand | Sonnax |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It replaces worn valve body parts in any Gen 2 6T75. Towing simply makes valve wear show up sooner as flares, slip and heat.
Gen 2 has no pressure switches on the TEHCM, six solenoid dampers and an extra checkball in the lower valve body. Gen 1 units need the 2007-2012 kit.
GM bulletin 18-NA-358 ties that shudder to valve body debris. The kit renews key valves and plugs, but heavily scored bores may need a replacement valve body.
If the fluid is burnt or the pan has friction material, yes. New valve body parts cannot save clutches that are already worn.
Dexron VI, checked at operating temperature, followed by erasing adapts and a GM fast learn with a scan tool.
