In 91 they brought in the HO, and I believe the open cooling system too. (may have been 92). Get as new as you can get, but 90 and later also had the C-clip d35 which is the weak link. If you can find an '87 w/ a factory d44, buy that. The non-HO's are not that much weaker, and the older you buy, the less you have to worry about vibes after you lift it. <img border="0" title="" alt="[Wink]" src="wink.gif" /> Good luck
'87 YJ, built 351W, T-18, NP-205, SOA, SRS, 35x12.50 ProComp MT's, cage, winch, Tomken bumper/carrier, d44/9"