Outer Limits 4x4 Board

can anyone tell me what the rear diff angle shoulb be along with the gearbox/engine angle

pinion angle and transfer output angle should be parallel.

but in a lifted car the diff is alot lower than the output of the gearbox, so if both angles were level, the tailshaft would be on a steep angle which isnt good. Wouldnt it be better to aim the pinion up towards the gearbox output?

yes that can be done, but you risk running the pinion gear dry.

In a typical driveshaft setup (ie; two uni's) the two outputs must be parallel to alleviate vibrations. As you have mentioned in a lifted vehicle the operating angle of the driveshaft may be too steep which will cause driveline vibrations. You can try to get around this be using raised engine mounts, dropped transfer case mounts and ensuring the pinion is parallel to the new transfer output angle.

In a double cardinal setup you have to ensure that the Pinion Uni Joint has no angle to ensure there are no driveline vibrations. I never had any problems with running my pinion gear dry ? ? ?