2004 GMC Envoy Tranny Problems

Dec 03, 2009 2 Replies
04 Envoy just recently had the transmission rebuilt at 115k miles. Now it seems it can't make up its mind which gear to cruise in. It jumps frequently between 3rd and OD. Any ideas as to why it would do this?

Sounds like a possible speed sensor problem. I would take it to a shop and watch it shifting on a scan tool.

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