Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Get a picture of your rear shackle angles.
I'm 100% sure that at that lift height the shackle angle is probably really crappy -> that results in very rough ride. If the shackle is close to vertical or the bottom end is pointing forward, you need to get shackle relocation brackets. Shackles should be at around 45 degree angle (lower part to where the leafs mount pointing backwards) for optimal ride quality and flex.
edit: Since you wrote the rear won't keep bouncing up and down when you jump on the bumper, I highly doubt the shocks are bad. Post a pic of the shackles and we are much wiser on the cause of your rough ride..
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***