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2002 GMC C2500 Transfer case I think

Tiny
JOHNUNGER1001
  • MEMBER
  • 2002 GMC C2500
  • 8.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 244,000 MILES
Hello pros, I have a gmc 2500hd with Allison trans. Push button 4wd. I can be driving along running perfect at any speed just putting along and all the sudden, it pops out of gear and makes a "zzzzzzz" sound from I think the transfer case. I let off the gas and it goes back in gear smooth as it can be. It does it every few miles. Anyone seen this problem? I changed the fluid. It was low. Still does it. I have tried unplugging the shift motor and no help.
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Tuesday, November 25th, 2014 AT 5:24 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Are there any warning lights coming on? Have you removed and inspected the actuator?
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Tuesday, November 25th, 2014 AT 5:34 PM
Tiny
JOHNUNGER1001
  • MEMBER
  • 3 POSTS
Thank for responding. No warning light on and are you talking about the shift motor?
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Tuesday, November 25th, 2014 AT 5:53 PM
Tiny
JOHNUNGER1001
  • MEMBER
  • 3 POSTS
The shift motor does work. It will go into 4high and 4 low fine.
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Tuesday, November 25th, 2014 AT 5:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Are you certain that the transfer case is the issue and not something with the transmission? Have you checked the linkage to the transmission?
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Wednesday, November 26th, 2014 AT 5:03 AM

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