Mabey this is a nube question but I often see advice on when conversion joints are needed and when spring perches need to be moved to go with a one ton drive train in a half ton. I have only done this once but I have an 87 V1500 shortbox and I upgraded to a 14 bolt ff and a D60. I didn't have to move spring perches or use conversion joints. I don't need this information for my build. I'm just currious and I'm sure other guys that are upgrading are too. I can't remember what years my one ton's came from but everything bolted in. I have 1350 rear joints that were for my 10 bolt and my 14 bolt. I check some vender web sights like Summit and the U joints seem to usually be 1350's in both 1/2 ton and 1 ton trucks. I guess I was lucky and I'm sure conversion joints and spring perches have to be moved often but when?