If you use an aluminum gear don't press it on cold,it will gauld and you will never get it to run straight,it will not mesh with the steel timeing gear and will also be very noisy plus will have a short life span.
I'm going through this problem as we speak.
I've herd that the trucks all had aluminum gears,my 49 half ton 216 had a fiber gear.
Might should have stuck with it?
PK.
