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Looking for insight into the GMC 6L90 Transmission
Posted to Transmission Forum on 5/14/2014 6 Replies

first of all, I got a 6L90 transsmission that "starts to take off, then slips a little bit and then bumps into gear" and goes just fine through all the other gears.

Now, anyone have a good source for diagnostic information on this model of trans. It has no accumulators, no bands and no servos. It is just clutch to clutch to clutch and works right nicley, when all things are well with it.

The other day I replace and Techm on another 6L90 (working on a small fleet) since this is a flood truck.......

Jerry Huff
Hamilton Autobody
Somerset, New Jersey, USA

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