Question about 1999 GMC Yukon

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Tranmission will not shift into next gear from

Transmission will not shift into next gear from starting position till about 30 mph or 3000 rpm never seems to go into overdrive there after engine runs around 2500-3000 rpm 55-60 mph and increases with increase of speed.

Prior Issues: Transmission would shift hard in warmer climate around 70 degree days after driving on the hwy for longer than 20 min periods after comming off hwy. vehicle would shift normal after sitting for awhile with normal street driving then would shift hard again after hwy driving. Only occurs during warm days cold days there is no issue.

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Try changing the transmission fluid and transmission fluid filter. It is a fairly easy but kind of messy job. Just buy the new fluid and filter, Grab your metric socket set and go at it. NEVER WORK UNDERNEATH A HOT VEHICLE. You have to pull the transmission pan to do this job. When you break the gasket seal several quarts (liters) of transmission fluid will cascade down on you. Be ready for it. Don't forget that when it stops draining there is still a lot of fluid left in the pan. When you finish cleaning up the fluid clean the gunk out of the pan. Install the new filter and reinstall the pan with a new gasket. Do not over torque the pan or filter bolts. If you strip them out or break them off you will need professional help to repair it. Refill the transmission with fluid. It should take six or seven liters.

Posted on Mar 20, 2010

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Posted on Jan 02, 2017

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