I just put in a th400 and spohn torque arm and the nut that hold the arm in the mount is hitting the driveshaft. it isnt grinding but you can see where it is leaving track marks. i have already shimmed the crossmember just to get it to this point. if i use the proper grade and length bolts I should be ok right. what do you think is the maximum I can shim it?

 

anyone?