I like the chevy's alot. I however don't care for the blocks i have to run, nor how i hit them on ledges and rocks. The springs are LONGG.. however, on yotakrawler's 3rd gen extra cab, he did not need blocks and it sat level with rears up front. he went with 3rd gen rear's i believe, but 2nd or 3rd gen id use either.
Duals are sick. I think one of the best upgrades i have done, but i don't know, it all works so well together, minus the diffs.
See i bought dual parts slowly and then out of the blue i got a bug up my ass and just bought everything remaining. Start doing that, but if i were you id either source 23 spline cases or buy the damn input gears while they are in stock. If you were closer id let you drive mine to try it out