okay well what is happeneing on my truck is the rear end is screaming like a banshee whenever I hit a bump or hit the gas.....my question was could this be metal to metal contact from the leaf springs, or the bushings?? I already had the u-joint serviced so no problem there, I am at a loss to what is causing this thing to make this noise, it makes the noise whenever you push it back and forth, and whenever the rear end flex's.....any suggestions would be appreciated. Thanks.
-Pete-

 

Have yu checked the rear diff fluid leval? Sounds like this may be the problem i have seen this many times at work,and the noise yu describe ,is what they sound like when there low,or something major going on inside there.

 

I just had it all serviced, a month ago, the rear and front diff, t-case, and tranny, but what all started this **** was one of my tranny fluid cooling lines coming from the radiator blew out and got tranny fluid all over everything....then about a couple days later after i filled the tranny up, it started squeaking, and took it to the dealer to give it a once over, that's when they changed my fluids, but the squeak has been getting progressively worse, and I can't figure out what in the hell it is......getting VERY frustrating, i had thought it was the u-joints but no go there, and still squeaking, that's why i thought it was the rubber bushings in the leaf springs that may have done it, cause it may have gotten in there and wore it out??? The suspension is running stiffer then usual, like when i go around turns I find I am spinning a tire, maybe something to do with the limited slip? But then again why would it only squeak when the suspension flex's? Sorry this is so long but I want to get ot bottom of this before I decide to sell the truck....but a 2500HD DMAX isn't looking to bad right now....thanks for the help.
-Pete-