where can i buy the correct size shims for the install?

 

you can't buy the correct shims unless you have the tools needed to tell you what shims sizes you will need. but if you just want to order shims.

www.courtesyparts.com

 

Do these really work?

 

Does what really work? The shims or the gears?

If you are asking about the gears, yes they do, and the shims may or may not be necessary for the installation of the gears.

 

Every ring and every pinion is different, as is every Gear Case whether it is of the same ratio or not---hence, each build has to be shimmed independently to achieve the specified specs for that unit.....Side gear clearance, pre-load torque, backlash etc.