GM 6T75 Archives - Transmission Digest
Sonnax introduces new pump vane for Ford and GM transmissions

Sonnax highlights its line of pump vanes for GM 6T70/75 (Gen. 1), 10L60/80/90 (Gen. 1 and 2), Ford 6F50/55 and 10R60/80/90 transmissions. Sonnax touts this pump vane (part no. 124533) as a cost-effective alternative to replacing an entire pump rotor assembly.

Diagnosing an Overheating Condition

For the purposes of this article, we were working on a 2008 GMC Acadia that required internal repair of the transmission. In this specific instance, a reman unit was installed as the replacement. Similar to the diagnosis and repairing of this unit, the R&R is fairly straightforward also. Paying attention to things like cracked flex plates, reprogramming of the TCM, performing Fast Learn and getting the transmission to the correct fluid level are important items to check for a clean installation.


The 6T75 has been on the road for a little more than a year now, and we’re beginning to see some problems with this unit. The first problem we ran into was at a Miami shop that was doing factory-warranty work for a local GMC dealer. The problem vehicle was a 2007 GMC Acadia, and there were some problems with the two-wire Hall-effect speed sensors.