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Stay away from the late 80's early 90's XJ's due to problematic fuel injection. I don't remember the specifics as far as what years but '89 and 90 are definitely a couple of them.
The only advantage the newer XJ had was the chrysler 8.25 rear end and that is only if you didn't have the dana 44. The new 2000-2001 had a low pinion dana 30 front axel. 84-99 had high pinion dana 30If an XJ is what you want, look for one that has a factory tow package. It will more than likely have the Dana 44 rear(87-90) and have 4.56 gears in it.