wait a minute the 258 4.2 lasted untill 1990 and I think the last year had a serp belt. So if that might be it. or maybe it came out of a XJ.
Rubicon Rich ,05 TJ Rubicon: PatriotJeepers.com
86 CJ7 258,T18,Scout Dana300,twin sticks,Dana44's,4W Disc, locked,35's,YORK OBA,Warn 8274,fullcage.
51 M100 1/4 ton Jeep trailer