Comp diff mount vs OEM diff mount

[vex]

The stock diff mount "should" be fine. It really comes down to the amount of torque you're going to be pushing through the system. The Competition or Solid Diff mount (I'm assuming you're talking about the front mount) will transfer more vibration to the subframe and to the body and cabin than the stock--but it also won't flex nearly as much when excess torque is applied through the differential. Something else to consider would be to install the Poly/Solid bushings in the rear mount of the differential. They will have a much larger impact on how much torque can be sustained in the system due to the moment arm.