Post by
PowerslavePA »
https://forums.nicoclub.com/powerslavepa-u309655.html
Sat Jul 01, 2023 1:24 am
Paint marking the shaft and flange makes sure you put the
shaft back on at the same orientation it was when you took
it off, so that it's not out of balance. This is sometimes
critical, but not all the time. It all wears together, so if you
put the shaft back on 180 degrees from the way it was, it
could vibrate at 60MPH or so.
I had an out of balance shaft on my Mustang for a year. I bought
a used one in Ohio for like $35, and slapped it in, and all the
vibrations were gone. So, there was no way for me to
install it in the correct orientation because it was from
another car.
What I did do, was rotate the shaft so that the U-Joints
at the trans and diff flange side were vertical. So, when
I put the replacement in, they were facing the same way.
I lucked out, here was no more vibrations from the shaft.