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I just bought an '88 for $500.
Any info would be great.
you sure as hell got a great price. one thing to bear in mind about the earlier XJs (up to about 92 IIRC) is that it has a closed pressure system.. note that there is no standard filler cap on the radiator. This can cause overheat problems in air pockets get into the block... it can be remedied by either "burping" the system or swapping it out entirely.
1. burping = parking uphill and pulling the tempurature guage (IRCC) and giving it gas to push air out of the block.
2. replacement = replacing the T-stat housing, radiator, hose and the heater control valve with like parts from a newer model cherokee... do this and you'll have no more problems.
other things I did, removed the carpet and used herculiner, installed a guarded switch in the dash and routed the electronic fan to it so that I can flip the switch when it heats up while off roading. I also bought some stock rubicon tires off a friend for cheap and then bought 16" steel wheels to match, great tires but the rubber is soft and wears fast.
if you are interested in the lift I used coils from a 78 f150 (I think), the top three leafs from an 87 Chevy S-10, break lines from a wrangler, and a home made 1" spacer to drop the transmission to eliminate vibes (although the safer bet is to buy a slip yoke eliminator but a young newlywed A1C will do what he must).