2013 3500 diesel pickuo

nremtp143 wrote:
It is called "launch shudder" and all of the Big 3 trucks are prone to it. No, not everyone of them does it, but a lot of them do. Both of my two diesels have had it but it is easily remedied. If it is worse when loaded say, with the weight of a fifth wheel, then you have it. Most easily cured by adding air bags to the vehicle. I know, I know, that's the reason you bought a 350/3500 to begin with is to be able to tow whatever you wanted to! The shudder comes from changing the pinion/drive shaft angle of the rear end. It has been widely documented among all 3 manufacturers as I said. Another way to fix it is to shim the rear end, however that makes it worse when unloaded. I have Firestone Ride-Rites on my dually and an onboard compressor so I can adjust on the fly. Both of my trucks were cured by using the bags as the pinion angle doesn't change as much.

Correct answer here. It is due to driveline angle, and you are feeling the U-joint oscillation. You can't have a perfect driveline angle at all various loads, unless you change the ride height. It doesn't hurt anything.

I know, OP, you fought it out with your dealer and now it hurts to find out you were wrong. You're going to have to find a way to deal with the pain. Publicly badmouthing Chrysler is one way I guess.