Re: How loud is it inside your cab?
Mine is nice and quiet. I painted the floor with herculiner, not sure if it helped that much. It's important the the trans and T-case boots are in good shape and secured well.
With a 12v it's probably just gonna be noisy.??
Early '99, 7.3/4R to Cummins 6.7/ZF6 CONVERSION, AIR LOCKERS, 4:11, 35", '05 HARLEY FRONT , TRAIL READY W/WARN.
6.7/ZF6 SWAP. IT'S ALIVE 11-13-12