Shim Questions

[98XJSport]

Ok long story short I need shims to bring my rear driveshaft into alignment so to speak. I have a 98 with a tcase drop and about 4.5" of lift, the last 1.5" being an extended shackle. How do i know if i need 3 degree or 6 degree shims? And is there any reason to spend the cash to go steel instead of aluminum? Thanks

 

[XJack]

Everyone is different, so you'll need to measure for the correct angle.

Minetook a 6 degree at that height, but I have an SYE and *don't* have a case drop.


Steel all the way - the aluminums will bend and flex over time, allowing for more spring wrap over time. Plus, they tend to crack when wheeled hard.

 

[98XJSport]

What parts do I measure? Ive never done any of this work before, so sorry if it seems like a stupid question...

 

[GudaXJ]

Hey I've got a 4.5" lift with a 1" tc drop and I use a 4degree shim. As for the shackle iono... But 4 deg works for me

 

[Yucca-Man]

Go here - http://4xshaft.com/driveline101.html About halfway down there are a pair of illustrations that show the angles you want. Measure along the length of the driveshaft and along the machined faces of the t-case output and the pinion.