Transmission Shifting into Overdrive

1998 CHEVROLET SUBURBAN
200,000 MILES • V8 • 2WD • AUTOMATIC
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PEABODYVEE01
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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?
May 28, 2016 at 4:31 AM
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HMAC300
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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.
May 28, 2016 at 6:13 AM
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PEABODYVEE01
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Thank you!
May 28, 2016 at 9:50 AM
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STRAILER
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Here is a guide on how to check for a vacuum leak

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

Let us know what you find
May 29, 2016 at 8:35 AM
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