4.5" lift - what caster?

[Jeep450r]

I'm trying to track down my faster problems and am working with my caster now. I am lifted 4.5" running 33's. What should I set my caster at? I have heard anything from 2* to 7*. What would be optimal for a DD?

Also what is the calculation to figure out your true castor angle from the diff cover angle?

 

[Outlander560]

7 degrees

 

[Original_MudButt]

...Also what is the calculation to figure out your true castor angle from the diff cover angle?

I'm pretty sure it's 6-7 degrees... But you may have to sacrifice some caster to save driveshaft angles.

To check it from the axle google "go-jeep". he has a page about checking angles.