Weird Vibration!

Phil I have a 70 Charger/Coronet factory serv. manual and looked in it at the 3 and 4 speed tranny's and it does show being able to remove the tailshaft on the 3 speeds in the vehicle but the 4 spd. tailshaft removal is listed in the "out of vehicle service" section. It's kinda a long explanation of how to do it so I won't write it here but if you want me to I can e-mail it to you. Just PM me with your e-mail address if you want me to.