I discovered that a rear transmission mount caused noise to telegraph up through the frame and into the cab. Once I removed it (I should add it was a rubber mount) the noise almost went away. In neutral I'll still hear some noise, but I don't believe the transmission has been rebuilt.

I was taught (long ago) to add 1 degree down to the pinion angle for spring wrap. If you have 4 or 500 horsepower or if you are hauling very heavy loads, you may need 2 degrees, but if you have a 235 you won't.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end