i put new tires on my 04 1500 had them balenced and got a alignment had the on there maybe a week then i blew my pinion threw the bottom of the diff i got a used rear end got it all back togeather and now a got a shake around 60-65 mph and higher i talk to a local shop they told me to check the drive shaft so i jack it up put it on jack stands put it i gear i didnt realy see any out balanced movement from it idk if i should pull it out and have it balanced any way or should i check other places ? ball joints are tight idk if rotors would have anything to d with it im lost any help whould be appreciated thanks

 

There have been guys who have had vibrations from the driver shaft or univ joints not torqued down

 

best way to check your drive shaft is to take it off and take it to a local machine shop. They can safely spin it there and determine if it is out of balance. They can also weld little weights on it to get it back to normal.