Odd, I have the exact same leaves in the rear of mine with the XJ shackle and it rides like A FRIGGIN SKATEBOARD in the back. The front end will be rippin a tire apart in the fender while the back has used up maybe an inch of travel. This setup is HORRIBLE for an XJ. Mine is the entire MJ pack with the eyes cut off the main leaf. The MJ packs are grafted onto the XJ main leaf, so I've got an extra leaf over the MJ. In its defense, I think a longer shackle should help the ride somewhat, as should removing the XJ main leaf.
But, it sure handles the trailer well. Even rides well with 200 lbs of gear and a 20 foot boat hitched up. Good for tow queen, bad for trail rig. I get about 6" of lift with stock shackles. MJ shackles give what, 1/2" of lift or less?
I believe the ZR-2 Chev S-10 pickups/blazers leafs can be used as added leaves to the XJ main. Also, spring under Dakota's and ever Explorers.
Jared

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