Powertrain?

Tiny
JERRY108
  • MEMBER
  • 2002 CHEVROLET TAHOE
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
Have a 2002 Chevy Tahoe with towing pkg. Tahoe has approx. 150,000 miles. Went to backup after putting in reverse and heard a clunk sound and then a whining sound. Get this same sound in park or nuetral but worse in reverse. No such noise in drive, but have only moved Tahoe a couple of feet since this happened. Have I dropped the rearend? Have a transmission problem? Thanks for your help. Jerry.
Friday, February 25th, 2011 AT 12:33 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Jerry:

That is a good question. I would think if the pinion or ring gear in the differential would have gone bad, it wouldn't move at all. In the transmission is what is called a planetary gear. It is called that because there are 3 gears that ride around another one to give you reverse when the low / reverse clutch is locked. Based on what you are saying, it sounds like that may have come apart. That sad part. It is the farthest gear back in the transmission before the sprag gear which is for park. If you can, have a helper start the vehicle, place the park brake on and hold his foot on the foot brake so the car can't move. Listen under the vehicle to see if it seems like the noise is coming from the transmission area.

Let me know what you find.
Joe
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Friday, February 25th, 2011 AT 2:05 AM
Tiny
JERRY108
  • MEMBER
  • 3 POSTS
Thanks Joe, I will try that in the morning when my neighbor can help and let you know. Jerry
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Friday, February 25th, 2011 AT 2:16 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Jerry:
Just be careful. Let me know what you find. I work from 6AM till 3PM eastern time, but check my email about 50 times a day for this job, so I'll get back to you quickly.

Joe
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Friday, February 25th, 2011 AT 2:20 AM
Tiny
JERRY108
  • MEMBER
  • 3 POSTS
Joe, Do I need to put it in any gear to check where the noise is coming from or just start it with the parking & foot brake engaged and in park? Jerry
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Friday, February 25th, 2011 AT 2:28 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Park and neutral Jerry.
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Monday, March 21st, 2011 AT 6:03 AM

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