Hoping maybe someone can offer a suggestion. I have a 1990 2 door tracker. It was running great for the longest time until this morning. After going off roading on sunday, lots of mud and water some bumps and rocks but I took it slow and I do not recall hitting anything I'm getting a whine or hum in the drive train. It wasn't there last night on the way home from the day's off roading, after driving 60kms to work this morning I could hear it a bit, then on the off ramp on the way home it was getting louder.
The hum and vibration only occur after 35mph and up. It only happens when I accelerate it disappears when I let off on the gas. I think it is coming from the back of the transfer case or the rear diff. It makes the same noise in 4wd as 2wd.
I had another issue with the starter and that was weird too but it seems to be working now so I spent most of the evening on that. I did change both diff fluids and the transfer case. They all had a bit of water contamination (cloudy and grey ) but not too bad I don't think.
Does this sound like u-joints or do you think it may be more serious? I will put it up on jack stands tomorrow night and get it running to check it out, any input would be much appreciated.
Thanks
Jim

Jim,
I would bet you have a U-Joint going out causing the whining in the drive line. The starter probably just had some mud and water in it.

Zig

Thanks zig, I'll try doing the universals tonight then. I posted another question about the starter, I would like to better understand what might be happening, hopefully you're right and it's just mud in there!
Regards
Jim