6T70 Shift Kit, new and ready to install. Fits the 6T70. Ships fast from the USA.
Most 6T70 shift complaints that are not a broken clutch part come from the valve body: a 2-3 shudder in an Equinox, a 3-4 flare in a Malibu, a TCC slip code on an Impala, or burnt clutches showing up again soon after a rebuild. This is a new Sonnax shift kit for the 6T70, and the parts in the photo are the Sonnax Zip Kit layout for the Gen 2 valve body. It is not a harsh-shift performance kit. It replaces the valves, plugs and piston that wear and leak in a high-mileage valve body so the control module can hold the pressures it commands.
The 6T70 shifts clutch to clutch. Its control module fires pressure control solenoids, and regulator valves in the valve body turn those signals into clutch apply pressure. When a valve wears its bore or an end plug starts leaking, pressure bleeds away and the module cannot fix it with adapts alone. The pictured kit addresses these spots:
Scan for codes and check the fluid level and condition first. A harsh 1-2 with no codes is often only unlearned adapts, which a relearn fixes for free. GM's 18-NA-358 bulletin also has you rule out engine misfire before blaming the transmission. If the codes or the pan point to the valve body, our 6T70 harsh shift causes guide separates adapt problems from valve wear and clutch tie-up, and the 6T70 Equinox shift problems guide walks through the 2-3 shudder diagnosis.
The listing names the 6T70 without a year, so the generation of your valve body decides fit. Sonnax's identification guide lists the Gen 2 tells: a TEHCM with no pressure switches, six solenoid dampers, and an added checkball in the lower valve body. Gen 1 bodies (2007 to roughly 2012) have pressure switches and use a different Zip Kit with nine checkballs and pressure switch parts. Transmission Digest notes Gen 2 parts entered in 2013 and appear in all 2014-later units. If your valve body has pressure switches, buy the 6T70 shift kit for 2007-2012 instead. Not sure? Send your year and VIN before ordering. All of our parts for this family are on the 6T70/6T75 collection page.
| Fits | 6T70 |
| 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. The pictured Sonnax Zip Kit restores worn valve body parts so pressures match what the control module commands. Shifts should feel like a healthy factory unit, not a firm performance kit.
Most 2007 to 2012 6T70 units are Gen 1, with pressure switches, and need the 2007-2012 kit. Check your valve body for pressure switches or send us your year and VIN.
It replaces the TCC regulator apply valve, which Sonnax lists as a cause of P0741, P0742 and TCC slip. A failed converter or solenoid can set the same code, so test those too.
The valve body and TEHCM are serviced from the side of the case, so a valve body job does not always need the unit pulled. Burnt clutches mean a full rebuild.
Refill with Dexron VI, then erase the adaptive values and run GM's fast learn so the module relearns clutch fill times.
