6T30 Shift Kit 2007-2012, new and ready to install. Fits the 6T30. Ships fast from the USA.
Early GM small-car 6-speeds have a reputation for codes that come back no matter how many solenoids get thrown at them. If your 2007-2012 6T30, 6T40 or 6T45 flares on upshifts, slips the converter clutch, burned its clutches, or keeps setting pressure switch codes like P0842, P0872 or P0877, the problem is often worn valve bores and tired pressure switch parts inside the Gen 1 valve body. This listing is the TransGo SK 6T40-A Shift Kit, the upgraded version made for all Gen 1 6T30, 6T40 and 6T45 units built with pressure switches.
On a Gen 1 unit the TEHCM does more than fire solenoids: it also reads pressure switches that tell the computer which clutch circuits are applied. That makes the Gen 1 valve body sensitive to two kinds of wear. The first is hydraulic. The AFL valve limits solenoid feed pressure no matter what line pressure does, the pressure regulator valve sets line pressure and boost, and the TCC regulator valve controls converter clutch apply; when those bores wear, pressure drops or wanders. The second is in the switches themselves, whose diaphragms and O-rings leak with age. TransGo's kit addresses both. It supplies a complete drop-in AFL system (steel bushing, hardened valve, spring, spacer and retainer) that works in the existing worn bore without reaming, a hardened pressure regulator valve with longer lands, a hardened TCC regulator valve with a scarf cut sealing ring, and four new pressure switch diaphragms and four O-rings.
Gen 1 units have known hard-part failures as well. A broken 3-5-R wave plate causes no reverse with P0776, and loose pressure switch rivets have caused neutral drops, so the pan and the switches deserve a look before the hydraulics get blamed. Our 6T40 common problems guide covers those failures, and the 6T40 harsh shift causes guide walks through separating a control problem from a mechanical one. If the fluid is clean and the problem is shift quality and codes, this kit is the right repair.
The SK 6T40-A fits all Gen 1 6T30, 6T40 and 6T45 transmissions from 2007-2012 that have pressure switches. It does not fit Gen 2 units. GM changed over to Gen 2 controls in 2012 and dropped the pressure switches, but some 2012 vehicles still had Gen 1 transmissions, so a 2012 needs checking before you order. If your unit has no pressure switches, use the Gen 2 6T30 shift kit instead. Send us your year and VIN if you are unsure. The same Gen 1 kit is also listed for the 6T40 as the TransGo 6T40 Gen 1 shift kit.
| Fits | 6T30 2007-2012 |
| Part type | Shift Kit |
| Condition | New |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Gen 1 units have pressure switches in the control solenoid valve body, while Gen 2 units do not. Most 2007-2011 units are Gen 1, and 2012 can go either way, so check the unit or send us your year and VIN.
No. The Gen 1 kit uses a drop-in AFL bushing system that seals in the existing bore. The Gen 2 kit is the one that requires the AFL-G2-TK reamer.
It includes new diaphragms and O-rings for four pressure switches, which fixes leaking switches. If a switch is electrically damaged or its rivets are loose, the TEHCM may still need repair.
Yes. The SK 6T40-A covers the whole Gen 1 family: 6T30, 6T40 and 6T45 with pressure switches.
Dexron VI. Set the level hot at the check plug and run the fast learn so the transmission relearns shift timing with the restored pressures.
