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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1670
Experience:  GM Grand Master Technician 2007. 14 year experience.
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1999 gmc sierra has to rev up pretty high rpm before it

Customer Question

1999 gmc sierra has to rev up pretty high rpm before it shifts into high gear. If i let up on the gas a bit it will shift.
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: Starts okay , put runs a little sluggish until it warms up. shifting problem the same warm or cold.
JA: What is the model of your '99 Chevy?
Customer: 1/2 ton gmc sierra 4x4 with the smaller engine
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: not sure if i want to tackle this one or not. so far i have changed the fluid and filter, no change
JA: Anything else you think the mechanic should know?
Customer: has about 170,000 on it
Submitted: 7 months ago.
Category: GMC
Expert:  Jerry replied 7 months ago.

Hello and welcome. My name is ***** ***** you for visiting the site.

Do you know if there are any trouble codes storing?

Does it take long in the other shifts? (1st to 2nd or 2nd to 3rd)