Moaning drive train?? Help...

[KStrasburger]

I'm hoping for some ideas from some of you guys. I drive an 01 HO and at low rpms 1000 to 1300 there is a moaning sound in what I thought was the rear end but dealership replaced entire rear end. Same sound continues. Took rig to another dealership. They hear sound feel vibration and can't find problem. They added two bottles of additive for lsd. Problem persists. Any ideas?

 

[Sky]

hmmm, Im getting a rear and "shudder" now too. I changed to Amsiol with the additive and im still getting the shudder when i pull my trailer around corners etc... Not sure what it is either. Hate to take it to the dealer.

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2001 QuadCab,SWB,Auto, 4X4,4" Flowmaster Exhaust, Bosch 275 Injectors, K&N... ... ... .