The real question is whether RK ends up with 30mm front and what the rear ends up being.
The rule of thumb used to be that 1 degree of caster was lost for each 1/2" of lift. They only had 3 degrees stock (from a good day at the factory). 2" lift gives you negative 1/2 a degree, 30mm would leave you with not much positive.
Made a massive difference to mine when the balls were slotted.
Have a County front diff in it now, same springs, not slotted, but with the correction bushes in the arms the new diff came with and it's just crap as far as vibration goes.
Never had that problem before and now have all the parts to slot the balls and rebuild the hubs.
Also have a set of SP non correction bushes to go in after, so the snout of the diff points towards the flange on the Tcase instead of the ground.
Everyone has a different experience with this, it's just a heads up for RK.
cheers, DL

