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I have the 4" flip with the 56" rear springs, i'm thinking of the 6" due to i wont be towing or hauling any heavy loads, but i'd like decent articulation.
The 6" shackle would get you 1" more lift and we usually don't use the 4" flip with the 6" shackle because it makes the spring hang down quite a bit, it points the pinion up more than you want it to and it increases the roll steer in the rear end which makes it drive worse.
To be honest, with a 56" spring, I don't think the 4.5" shackle will limit your articulation at all.
years ago i did there greasable bolt/bushing kit on my truck . rode a lot better .
and otherday on my project 2wd truck i have all poly in it also , i had to pick it up on the lift and thee suspension droped more than i was use to seeing as thay dont bind like rubber.
best simple small part upgrade out there for better ride.