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2007 4300 Allison Trans issues

David Osofsky

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Howdy All

I have a 2007 4300 with a Allison auto trans giving me issues. When I first put it reverse she seems to be slipping. I select drive and same thing. Put it back in reverse and works fine but still slipping in drive. 
When first selecting drive, I get a hard shaking on the driveshaft near the E brake drum. I’ve checked fluid levels, wiring to the TCM & fuse at battery. Seems fine. I did find a little bit of trans fluid inside the main transmission connector at the transmission. Could this be my issue?

any thoughts on how to resolve this issue?


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Mine (2006 model year) had this issue as well. Replaced the speed sensor, and that helped for awhile. Final solution was replacing the trans wiring harness. Mine had a few places where the wiring near connectors had corroded but was not visible. Found a couple of places that the ground wires rotted inside the wire covering.

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