noticed today my truck started grinding in reverse, sounds kind of like dragging concrete block across the driveway. any ideas, doesn't drive weird or anything else, i recently did my front brakes and that stopped the squealing, but i have not touched the rear brakes. bought it in november 07 with 52k on it, currently 66k. i havehad the differentials and transfer case flushed, as well as routine oil changes, have not changed the transmission fluid yet, slightly gun shy since the tranny on my 00 silverado went out shortly after i had it flushed,(pan drop, new filter etc.)
i do have 7/70k powertrain warranty, but thats it. if someone can give me some help that'd be great.

 

If you have not done the Transmission i would. i did mine at 20K and i noticed less noise with the shifting and little better acceleration. I went with Royal Purple, alot of guys go with AMSOIL its a good product too. but try changing the fluid but if you haven't in the whole 66 thousand miles it might be a little risky but i would do it and use a differnet fluid than MOPAR fluid. thats my 2 cents.