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1991 GMC Jimmy 4 wheel

Tiny
LONGBEACHCHIK
  • MEMBER
  • 1991 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 144,000 MILES
When I put it in 4 wheel it doesnt engage, could the hubs be dirty and need to be greased?
Sunday, January 17th, 2010 AT 7:39 PM

2 Replies

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Hi
longbeachchic.
No the hubs are probably fine. There is a electric motor on your transfer case that moves when you push that button and another on the front axle. One of these is full of dirt or water. You can disassemble them and clean. Or replace them and your 4 wheel drive will work.

Ty billymac
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Sunday, January 17th, 2010 AT 7:50 PM
Tiny
JIMMY_JAMES
  • MEMBER
  • 4 POSTS
The 1991 may have still had the vacuum switch on the transfer case. It is like a 13/16 nut with a few vacuum lines plugged into it.
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Tuesday, January 19th, 2010 AT 2:30 PM

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