Having problems engaging 4wd - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-20-2004, 08:52 AM
Blk88GT
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Having problems engaging 4wd

A few months back, a small needle bearing in the front diff decided to give up on me, allowing the axle to compress the small circlip holding the axle into the housing, and it slid out and destroyed my passenger side CV shaft.

I fixed that all up, and just recently have had problems engaging 4wd.

When I shift to 4x4, it sounds like the front diff is having a hard time engaging. Almost like the slip collar in the front end isn't sliding overtop of everything properly. You can hear a horrid grinding noise.

I replaced the actuator with a known good one with the same results.

Does anyone have any suggestions as to what this could be? I'm thinking a stripped out slip collar, or bent actuator fork.

Any help would be appreciated. The truck is a 90 GMC K1500.
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post #2 of (permalink) Old 03-20-2004, 10:48 AM
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Re: Having problems engaging 4wd

Try running power directly to the actuator. It might be the switch in the transfer case that is bad causing the actuator to go on the fritz.
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post #3 of (permalink) Old 03-20-2004, 02:17 PM
Blk88GT
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More info...

I forgot to add that if I'm in 4x4 and stop quickly, 4x4 disengages and then grinds/pops when I go to accelerate.

What exactly happens in the transfer case when I shift to 4x4, and how do I run power to the actuator?
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