Hey all,

Lately I have been having an issue with my 05 jimmy. it has a 4.3 nv3500, and while I'm in 2wd I am frequently met with a whining or grinding noise, kind of sounding like it's coming from the front differential. When I switch into 4H though, the noise immediately goes away. Putting it back into 2wd is okay for about a minute or two, then I am met with the same noise as before. I have been driving around like this for a few months now, and am starting to get very worried that it will screw me over soon. I would like to get to the bottom of it, without burning a hole in my pocket at a professional mechanic.

I did read other threads about it being numerous different things, such as the transfer case vacuum switch, 4wd actuator, input shaft seal, and the front axle not fully disengaging. I feel like it could be the axle not fully disengaging, but I could be wrong.

This could also be a sign that my jimmy wants to get a SAS lol

All help is very much appreciated!!!
Thank you so much

 

Can't be sure myself but your research of the other threads hit all the ideas I could come up with. The only thing to possibly add is if it is a front wheel bearing. I can't help you with details but I'd start thinking of how I could test which one of those possible failures could be the culprit.

Then again, doing a SAS could be the way to go!