I dont really want lockers in my XJ, so I'm looking at getting a pair of detroit true-trac limited spiral-gear LSD's. Yeah, they are $400 each, but I've watched a guy in my local club in a FS bronco and am really impressed with them. they work so well, I've only seen it stop pulling with all four wheels one time and it was because he was off camber in a trench with the DS wheels riding the bank. It stoped for a second, but when he touched the brakes for a second, it started pulling again and walked right out. He says he can't even tell he changed the diff's out with them, and it drives excelently on the highway. Now, I'm building mine more for camping and light trails with plans for a locked/spooled FS J-truck in the future, but after watching Brett in the big Bronc, I dont know if I want a locker in the J-truck either....