GM 6L80/90 Archives - Transmission Digest
Sonnax introduces GM 6L80, 6L90 output planet saver kits

Sonnax has introduced new output planet saver kits for GM 6L80 and 6L90 transmissions. The company says these kits can repair and prevent common concerns and save the planetary assembly when installed. The kits (part no. 104584-80K for 6L80 and 104584-90K for 6L90) include upgraded pinion pins to supply continuous lube to the small gears.

Sonnax introduces Sure Cure Kit for GM 6L80, 6L90

Sonnax has introduced a Sure Cure kit for rebuilders of GM 6L80/6L90 transmissions. The company says this kit can restore shift quality and repair common TCC trouble areas, offering products to help rebuilders repair worn areas and protect the transmission against future damage. The kit is part no. SC-6L80-6L90.

Sonnax releases GM 6L80, 6L90 low/reverse sprag rebuild kits

Sonnax introduced a new low/reverse sprag rebuild kit for GM 6L80 and 6L90 transmissions. The company says users can use this kit to replace the element, retainer plate, end caps and snap ring in these transmissions without buying an entire sprag assembly.

Sonnax-104642-80SK-600
Freudenberg-NOK adds new line of TransTec bonded pistons

Freudenberg-NOK has announced a new line of TransTec bonded pistons. According to the company, Freudenberg-NOK bonded pistons are engineered and manufactured by the same machinery and same people as FN pistons, and are made in New Hampshire. Transmission models covered include the ZF 8HP45 and 8HP70, the Chrysler 62TE and the GM 6L80/90.

TransTec-Bonded_Pistons-1400
Potential causes of an overheated transmission: It’s not always what you think

If a transmission starts overheating, the root cause must be something to do with the transmission itself, right? Not always. The following are a few examples where the transmission was not to blame. Exhibit A: GM 6L80/90 The first overheating case comes from GM 6L80 and 6L90 transmissions equipped with a thermal bypass valve in

Sonnax introduces remanufactured TEHCMs for 6L80/90

Sonnax has introduced a new line of remanufactured TEHCMs for GM 6L80 and 6L90 transmissions. Each unit is fully electro-hydraulically tested to comply with OE performance and VIN-blanked for easy programming to any applicable vehicle, the company says. Coverage includes the following:

Raybestos introduces new 6L80/90 clutch packs

Raybestos has introduced a new GPZ performance friction clutch pack for the GM 6L80 and 6L90, model years 2006 and on. According to the company, this clutch pack contains upgraded friction components manufactured with a blend of GPZ high energy fibers for ultimate stress and high temperature durability. This kit includes 6 GPZ565 1-2-3-4, 6

Raybestos-Friction-Clutch-Pack-1400
Transtar highlights cooler flow bypass kit for GM, Allison

Transtar highlights the TransGo cooler flow bypass kit for GM 6L80, 6L90, 8L45 and 8L90 models as well as Allison 1000 transmissions. Years covered range from 2014 to 2022. According to the company, features of this kit include: Provides all-time cooler flow regardless of temperature; Prevents overheating; Reduces transmission fluid temperature; Eliminates thermostatic assembly; Allows

Superior Transmissions introduces pump components for GM 6L transmissions

Transtar highlights a new line of Superior Transmissions pump components that fit all variations of GM 6L45/6L50 and 6L80/6L90 units. According to the company, these can be installed in conjunction with the STL012 pump upgrade kit or any O.E. Main Pressure Regulator valve, as well as all aftermarket P.R. valve repair kits, including oversized internal

Easy fixes to common transmission problems

Transmission makers are always throwing the repair industry curveballs. The challenges seem endless. Sometimes manufacturers will let us know of changes they are doing, while other times they let us figure it out as we go. I would like to go over a few examples we’ve encountered that may help you on a simpler installation

Dealing with GM 6L series rebuild issues

During a rebuild of a GM 6L80 transmission, while the valve body was being serviced, an incorrect spacer plate was accidentally used. This blocked supply pressure to the 3-5-R regulator valve which prevented the 3-5-R clutch from applying. One of the more significant changes made to the valve body for 6L80 series transmission is related

Watch: The critical gasket for the GM 6L80

Calling it the “gift that keeps on giving,” Dave Hristko, technical product specialist for Transtar, uses this video from the Transtar Garage Studio to talk about the GM 6L series. “But there’s something that you can’t get from GM that I believe is seriously critical on this unit,” he goes on. “And that’s the stator

GM-6L80-Gasket-1400