A: The 4.2L sometimes had serpentine belts in FSJs after '82 (especially export rigs. I saw 4 in Canada) but the AMC V8 ran Vee belts till the end of the line. I helped a couple guys working on a 401 a couple years ago dig up the parts they needed to convert to serpentine belt, but lost the paper with the part numbers and diagram. (they had to change the impeller on the water pump for reverse rotation) From: <mail@xxxxxxxxxxxx> To: mail@xxxxxxxxxxxx Subject: re: AC swap in my 1972 Gremlin. with a V8 ...Sanden compressor...80's to 91 Grand Cherokee As far as I know all full size Jeeps use V-belts. The different compressor numbers will either desgnate v-belt or serpantine. They may also designate dissplacement. Which one is best? I would ask. Larger is not always better with compressors for A/C. P/S Pump will match the old box, just change out the high pressure fitting and valve and spring from your old P/S pump. If you have all the 73 stuff get the adapter Frank mentioned and don't worry about changing it over. I posted the answers just in case someone else was interested and because you asked! Mark Price mpriceATwestco.net Morgantown, WV 69 AMC rambler, 4.0L, EFI, 5 speed 65 Ambassador Conv, 327 AUTO, Basketcase 01 S-10 CREWCRAP 4X4