Question about 2000 GMC Sierra

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Does not up shift to third or forth gear soon as it should.

Does not shift to forth till about 44 or45 miles an hour.

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Posted on Jan 02, 2017

  • 295 Answers

SOURCE: 2001 Yukon XL SLT 4 speed Auto Transmission shift problem!

Sam,

I would start with a transmission fliud and filter service.

I would then have the trasnmission checked out by a transmission shop. The transmission most of the time has the direct drum band is starting to go. The shops can rebuild it no problem, This is a very common failure wiith the trasnmission.

Good Luck

Posted on Aug 16, 2009

Testimonial: "Thanks alot richtko94'! I'll try that!"

03chevy
  • 79 Answers

SOURCE: Shifting Problems

when has the last time you had a trans serv. done on it? if you take it to a shop the will tell you that you need a rebuild. thrid gear and over drive are about burned up.

Posted on Apr 27, 2010

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1 Answer

Why when i put in drive and go it goes into 1 or2 or drive by it self while driving


It always starts out in first, it's a 3 speed automatic, that's what automatics do. they start out in first and at about 15-20 miles per hour , they shift to second gear, and when the speed is about 35-45 MPH, the transmission automatically shifts into third gear, or Drive.

Bigger automatics have 4 or more speeds. Till recently, 4 speeds were the norm, and fourth gear was often dubbed Overdrive, as it allowed the engine to run slower in 4th gear, than it had to maintain speed in 3rd gear, drive. It's good, it increases your mileage per gallon of gas, so you save that way, but like all things more complicated, they cost more to fix when something goes wrong.

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Let me see know at 45 miles per hour a vehicle usually shifts gears into the highest gear so could it be the torque converter hanging up and not shifting quick enough or maybe its the U joints. Have the transmission fluid checked for proper level and color.
Here's a small test for you when your accelerating up to 55 miles per hour try letting off the pedal at 44 miles per hour and then reaccelerating up to the 55 mph and tell me if it`s smoother if it is then chances are that it`s hang up on third gear. There's also a electric sensor located on transmission that assist shifting it`s usually controlled by the engine timing.
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