This is only the second time it has happened. The first time I dismissed it as just being the driveshaft hitting the gas tank. I don't think this is it though because both times the suspension was hardly flexed in the rear.
The first time I was offroad backing up hill and had to give it some gas to get it to budge and then EERRRRRRREAAAK!!!!!!!!!!!!!!
Last night was similiar except I was backing the rear driver side slightly onto a snow bank. This was similiar to last time because I had to gas it a little to get it to move and then that loud horrible noise again. My buddie's wife was outside and I don't think she was very impressed.
Has anyone else experienced this? Please tell me this is normal.

 

This has happened to me twice now and would like to know what it is too.


Seems like a slipping clutch or something, but I'm auto....like there is too much resistance and something is slipping anyway...always when I'm giving it lots of power and its not moving going backwards....

 

I heard that noise (or a similar one) a couple times last year on my truck when backing up in 4hi. Both times my tires had something in the way to overcome. The 1st was a curb, then next was a burm of snow that I tried to bust through and didn't quite make it. The noise was an "eeeek" type of sound and my guess was a bushing getting squished or something like that. I removed my sway bar because one of the links broke (totally unrelated) and I haven't heard the noise since (but I have backed up in 4hi lots and lots of times up hills, over rocks, in snow etc... My theory is that the front suspension drooped with the rear pulling on it and the sway bar rotated in the bushings. I'm not sure if I'm right, but I have tried to recreate the noise with my sway bar off and can't.

 

^I already have my rear sway bar removed though, so no luck there...but it does sound like the same situation and sound as mine...

 

I was talking about my front sway bar (was the one I removed).

 

hmm...really dont think it was the sway bar though. I could feel a vibration, and it felt/sounded like it was more coming from the middle of the vehicle (transfer case/transmission area) as opposed to the front.....