Originally Posted by sammyg
Just as a heads up, if you have an Advance Adapters SM420 to D18 adapter, and want to run one of their tapered bearing conversions (Which is awesome by the way) you'll either have to take a carbide burr to the adapter to clear the castle nut on the back, or possibly install the shaft backwards.
I am pretty sure the front part of the intermediate shaft bore is smaller the rear part....or the OEM shafts are tapered ever so slightly. My OEM 1.25" shaft was REALLY tight the last 1/2" or so.....like deadblow hammer and swearing tight.
Anyways, might measure the AA parts to see if they CAN go in backwards?