Can be of some use
I matched up a spicer 18 to sm 465 munchie gearbox whit a conversion of Novak, we went for a test drive and some hauling en wining apears.
No way I could find the problem, I did some braking down on the tranny and gearbox, the problem was the endplay of mainshaft from the gearbox.
When you are installing this conversion make sure the endplay is 0,00 inch,
the trustwasher novak included did not compaire whit the endplay there was left, so I put one in of 0,60 mm (metrick).
No harm to Novak, great conversion shop.
V8 HILLCLIMBER CJ-7