Im going to be swapping out my poly/rod ended phb and rlca's for poly/poly to cut down on noise and harshness. My question is when i upgrade to a 8.8 or 12 bolt will i have to resort to having to use adjustable?

 

I always suggest adjustables for any aftermarket rearend. Each rearend manufacturer will put their lower control arm bolts in a different spot, just like torque arms mount differently and spring perches are welded differently. With a PHR, sometimes it's way off, sometimes it's spot on. Having one that's on-car adjustable leaves the option open to lower the car in the future, and it also gives you the adjustment you may possibly need with your aftermarket rearend housing.

 

If the new diff has the brackets in the same location you should be fine.

If you have rod ends we may have Roto-Joints to take their place. Or do you already own the poly/poly?

Ramey