transmission slipping

2008 GMC ENVOY
214 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC
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BIGGS
  • MEMBER
  • 16 POSTS
slipping in third gear after warming up.
May 29, 2017 at 7:07 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
Hello,

I would start by serving the transmission and replacing the filter. Here is a guide to show you what you are in for when doing the job

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Please let us know what happens.

Cheers, Ken
Jun 1, 2017 at 11:34 AM
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