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Transmission Shifting into Overdrive

Tiny
PEABODYVEE01
  • MEMBER
  • 1998 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I recently had the intake manifold gasket replaced on my two wheel drive vehicle. Since that time it appears to have a transmission slip/clunk when it shifts into overdrive. Is it possible there could be a loose, disconnected or deteriorated vacuum line causing this issue? If so, where is the line located?
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Saturday, May 28th, 2016 AT 4:31 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The transmission uses no vacuum, but you could still have a vacuum leak. Check hoses etc. Scan for codes auto parts stores does it for free. It may be a coincidental thing that has happened.
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Saturday, May 28th, 2016 AT 6:13 AM
Tiny
PEABODYVEE01
  • MEMBER
  • 2 POSTS
Thank you!
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Saturday, May 28th, 2016 AT 9:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
Here is a guide on how to check for a vacuum leak

https://youtu.be/xN5pcM-5bso

Let us know what you find
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Sunday, May 29th, 2016 AT 8:35 AM

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