Ramcharger vibrates after using 4wd

Does it have automatic front hubs? I had a Bronco do the exact same thing. One side would get stuck.

It sounds like your front axle didn’t disengage. I’ve had several trucks with the cad axle, they are a lot more dependable when you get rid of the stock vacuum actuator and replace it with an aftermarket cable. 4x4 posi lock I think is what I bought. Works much better
Had this with my 81 w150. Put it in 4wd and one side wouldn't disengage when I went back to 2wd
As soon as I popped the hub off (unscrewed from rotor) the hub "snapped" and I reinstalled it, problem gone. 81 was prior to the CAD system. I wound up getting a set of WARN flip hubs for it and never had that problem again.
Started after a brake job and bearing repack. I figured the on side that had a hard time releasing, the wheel bearings wound up slightly tighter than the other side, with how you have to play with the adjustment til the lock plate can engage the pin in the locknut on those 4wd trucks.