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On a 1998 GMC jimmy 4x4 What would keep the front differential from locking in?
Wiki User
∙ 12y ago
On the transfer case, there is a set of vacuum lines. If any of them get old / brittle or melt, it will cause a vacuum leak. These trucks have a vacuum actuator under the battery that locks the front axle. if this unit is getting no vacuum, leaks, or is not connected to the cable, the problem you describe will happen. You can test your front axle by first putting your jimmy (or blazer) in 4LO, then shut off engine / apply parking brake. Jack the front wheels (both) off the ground at the same time. Have a friend try to rotate one wheel at a time while you manually push the vacuum diaphragm in on the unit beneath the battery. If the wheels stop turning, that means that your diff is ok. You need to start checking vacuum lines. if the wheels keep turning, well that's another story. Sometimes it takes a few rotations and a lot of fiddling to get it to actuate, cause normally you are driving forward slowly when it engages. You have to "replicate" that.
Wiki User
∙ 12y ago
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on most 83s the front axle is locked by vacume. There is a vacume canister on the right hand fender well under the hood check the vacume hoses to the transfer case
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Check the vacum control unit located under the battery. Hook a vacum gage to the unit and see if it will engage if not relace unit. If it does engage trace vacum lines back to source.
Will a front differential work as a rear differential on a Honda 450 ATV?
I'm sure one with the right tools could fabricate it to work.... But for the general, the answer would be NO. The front is a different type of gear system. It also used different axles and mounts differently.
What would cause a 1993 gmc z71 4x4 not enage to for wheel drive?
The front axle on these trucks have a mechanical actuator that locks the front differential in. They have used vacuum, thermal and mechanical means for this. The mechanical is the most reliable. This is a common fail point on the Chevys/GMCs. It is located on the front axle next to the differential.
Wiring diagram for 89 Chevy?
my 1989 Chevy 4x4 front differential wont engage any idea on how to trouble shoot the solenoid on the front pumpkin would be great
