DMB Esq

That is not really a constructive answer. That's probably the worst idea I've ever heard. Perhaps they can sell me an oil change, a brake fluid flush, and a radiator flush while I'm there, oh! and throw in some wheel bearings just because... Most of us on this website, either use independent people, or we work on our own cars, so that's why we ask the people who actually deal with these issues, or have come across them during the course of their ownership.

DMB Esq.

MBNUT1

I would first check the flex discs, and drive shaft center mount bearing as has been mentioned and if the front diff to transfer case u-joint in it has play in it replace that. Would also check engine mounts, though they usually present wear as an off idle vibration. What usually goes in the transfer case is an internal bearing which presents itself as a whining noise around 20- 40 MPH (no real vibration). It is not likely a cracked wheel because you only feel it during acceleration.

Edit:
I should add I have had my transfer case rebuilt twice due to a bearing failure and my front differential replaced once. The front differential was replaced because the indy claimed it was making noise and he showed me that the oil had glitter. I never heard it. I had flagged a noise which turned out to be the transfer case needing to be rebuilt the second time.
Also have had my engine and transmission mounts replaced.

None of the above resulted in a shudder upon acceleration.