Duff.........?????

[NYLES]

How do I figure out what degree shims I need to go under my rear springs? ZF shortend drive shaft and has 3.5" rear springs, looking at it I can tell it could use some help.

 

[Apogee]

Angle finder...or whip out your straight edge, tape measure and calculator and start doing the trigonometry.

 

[landshark99]

How do I figure out what degree shims I need to go under my rear springs? ZF shortend drive shaft and has 3.5" rear springs, looking at it I can tell it could use some help.

You need to use an angle finder to find your pinon angle and go from there.. heres a decent write up.

http://classicbroncos.com/pinion_angle.shtml

 

[NYLES]

yea I forgot how to do all that!

 

[NYLES]

Printed and believe it or not I actually have that angle finding bubble thing a ma jig!

used this pic from that article mines way worse than this!

 

[Hozr]

Fairly similar combo I ended up needing 6 degree shims.

 

[Whoaa]

6* shims seem to work well for a 3 1/2" lift http://www.wildhorses4x4.com/product/Steel_6degree_shims

 

[NYLES]

They is ordered

 

[NYLES]

that took a whole hour!