SNOWKING, as you know truck makers make small changes at all times in mid year and new years, however they are basicly the same. Then sometimes they make huge changes in mid year. The "91. 5" was one of those years for the Dodge CTD. They came out with the intercooler, larger crossflow radiator, higher volume oil pump w/larger piston cooling nozzles and a larger turbin housing. In "92" you could get cruise control on the manual transmission and the Alt. lost the junky voltage regulator, also the add on tach was prewired. In late "92" or early "93" they went back to the #18 turbin housing and a small change in the air filter. These are just some of the changes I know about, some of the big first gen guys know a whole lot more!
"NICK"