2000 GMC Jimmy popping sound after engaging 4WD and acceler

Tiny
MATTYSHORE
  • MEMBER
  • 2000 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 93,000 MILES
I own a 2000 gmc jimmy with about 93,000 miles. When I engage 4wd and start to accelerate I hear a very loud popping noise. Like its not fully engaging. The lights on the dash are on normally like they should be. I can feel the wheels grip in the front still. After getting a little more up to speed the noise stops. But when im in first gear and accelerating its pops. Its very loud. In 2wd it is normal. I used my truck to drive up to the ski resorts in new york. Its all stock. I have owned it since 71,000 miles and it has been a good truck. I want to know how to fix this problem as I dont want to be stuck in winter on the side of the road. Thanks for your help
Saturday, November 7th, 2009 AT 2:22 PM

2 Replies

Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
Sounds like either a bad CV joint or tri-pot joint. It is possible that it is a bad U-joint in the drive shaft as well. A remote possibility is that the front axle vacuum is weak and causing the axle to engage/disengage as well.

I would suspect one of the joints first.
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Saturday, December 5th, 2009 AT 12:20 AM
Tiny
MICKEY-D
  • MECHANIC
  • 304 POSTS
Another possibility could be the transfer case.
Some of them a large chain inside, and it could stretch, or the sprockets that it drives can be worn. Hope this helps. Mickey-d
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Friday, December 11th, 2009 AT 5:20 PM

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