OK thought I might ask here been trying to figure out a problem I'm having. If I am driving normal everything operates perfectly but if I try to accelerate hard I get a gear grinding noise from either the trans or the transfer case. It does it whether its in two wheel or four wheel drive so I am pretty sure its not the rear end. again as soon as I let off the gas and not hit it hard it sound normal. Anyone seen this before?

 

ok I guess no one has ran into this so I will keep this updated I am beginning to think it might be the torque conveter, hook a heavy trailer up and it does it a lot quicker. any clues on how to check it? fluid for trans is clean.

 

It couldn't hurt to check for a broken motor mount or transmission mount.

 

Thanks I will have to check for that as well, nice to see someone from Michigan!

 

I don't know what xfer case you have but it sounds like yours has the internal chain and it is stretched and is skipping teeth under load

 

The transfer case I believe is a NP236 I was thinking that but would it happen both in two and four wheel drive, wouldn't the chain just slip in four wheel drive not two wheel?

 

I'd take a good look at the u joints, look for excess grease on the floor pan or rust on the u joints. Next check your fluid levels trans,t-case rear end. Then look for leakage at the rear wheels, could be a bad bearing.These noises can be a pain to diagnose, I recently changed the left rear bearing and was convinced the noise was coming from the right front.

 

wondering if u ever found out the issue? Sounds like the same issue i have. Except my t-case got rebuilt thinking that was the problem and its still making that noise.