does that mean I have to use the 3.07's, or just take out the posi element and put it on the 3.55's?
this D30 is a HP axle, unlike the LP i have in the other MJ. 4x4 swap will have to wait for a while - next year or this winter most likely, unless someone wants to help me out.
The posi cannot be swapped without re-setting up the gears. And gears are not swappable between LP and HP axles.
Have you ever set up gears before?