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After SUV has been running for a couple of minutes the transmission acts up

Tiny
TOMMY HENSEVELT
  • MEMBER
  • 2000 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 220,000 MILES
My transmission seems to shift in and out of gear or does not catch a gear. When I start the car it shifts fine, but after running maybe two minutes it acts up. If I shut off the engine for a minute, it shifts fine but again after a couple of minutes, it wont catch any gear (reverse, drive, 1, or 2).
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Monday, October 24th, 2016 AT 12:39 PM

2 Replies

Tiny
TOMMY HENSEVELT
  • MEMBER
  • 2 POSTS
I forgot to add that the fluid level is fine, sorry.
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Monday, October 24th, 2016 AT 1:10 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hey Tommy,

Is sounds like the front pump seal have gone out and the pump is sucking air, is is common when the transmission has gone out.

But if you have not serviced the transmission lately I would try that first.

Here is a guide on how to do that.

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

I amuse it is original with 220,000 on it? if so it have a good life, now it time for a rebuild.

Please let us know what you find so it will help others.

Best, Ken
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Thursday, October 27th, 2016 AT 4:42 PM

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