Forum Discussion
Service writer can't be certain, especially sight unseen....but said something like, "years ago, in the previous series of 1500's, we had this issue...traced it back to the drive shaft being shifted to a weird angle when the vehicle is heavily loaded"...apparently their (then) solution was some sort of lifting block, that solved the problem when under load but created the situaation of rumbling when the trucks would be empty
Its called drive line shudder.
When Dodge came out with the new 3rd gen 2500/3500 trucks in '03 they had a SB to cover that issue with the two piece drive shaft.
My '03 (in sig) had the shudder under hard acceleration under 15 mph with a heavy load.
The new 3rd gen had no upper over load spring pack and was a weak sister with just 1800 lbs in the bed.
I fixed my drive line shudder issues before the SB came out by adding Supersprings to the rear suspension.
The SB changed the drive line angle with a different center carrier bearing mount.
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