overheating transmission

1999 GMC SIERRA
226,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
RINKRATT14
  • MEMBER
  • 2 POSTS
I have a 99 GMC Sierra 2500 4 wheel drive with a 6.0L engine,an a 4L80E tranny. Today the transmission temperature gauge indicated it was overheating. all fluids are good the cooler seems to be clear and there are no leaks. What is the normal transmission operating temperature of this vehicle, and could a bad transmission filter cause overheating? what other things could be the cause?
Feb 12, 2011 at 5:22 PM
Advertisement
Avatar
MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
I would get the transmission checked ASAP, the cooler will have to be flow tested you can't tell if it is part blocked any other way, a blocked filter may cause some problems, but slippage is the main cause, with that said, it may even be a faulty temp sender, a scan may show that up, a trans tech is qualified to do all these tests and more, do not delay, if there is a problem it may cost a lot more if you wait.

Mark (mhpautos)
Feb 12, 2011 at 6:36 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle