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1991 Chevy Truck 4WD not engaging

Tiny
KETCHEMONTHERUN
  • MEMBER
  • 1991 CHEVROLET TRUCK
  • 6 CYL
  • 4WD
  • MANUAL
  • 160,000 MILES
When I put the 4wd lever in 4wd the light comes on but when I try to move forward the gears grind in the 4wd part of the drive train. It has auto 4wd locking hubs. Where should I start, there was no warning of this failiar.
Wednesday, October 8th, 2008 AT 4:42 PM

2 Replies

Tiny
CBUSHRUN
  • MEMBER
  • 1 POST
Hey ketchum, A friend of mine had a GMC Somoma and the 4wd wouldnt engage either. We fixed it when we realized the vacuum line that ran to the front differential was not connected. I dont know how yours engages, but would be worth checking.

See if you can locate a wire or line from the front differential and trace it.

My.02, worth checking
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Wednesday, October 15th, 2008 AT 11:52 AM
Tiny
KETCHEMONTHERUN
  • MEMBER
  • 2 POSTS
Thanks, I checked the line is there, there are 2 sets of wires going to the front diff. 1 is for the accuator and the other goes into the dif.
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Wednesday, October 15th, 2008 AT 12:32 PM

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