a buddy used too have a 7 inch skyjacker on his 83 with stock shackles in the rear the springs would flip the shackles forward and make it ride like a log wagon but after he put 2 inch lift shackles on it helped alot, i dont think the driveshaft was at a major angle but it was pretty bad thow might have too shim it some. i think he had 7 inch skyjacker springs 2 inch shackles and 3 inch body and it cleared 38's easy prob could have even flexed 44's a lil but the dang thing was so stiff it couldent flex a speedbump without lifting a tire till it got broke in and settled, those springs settle bad!!!!!! prob lost about 4 inches of lift after the got broke in.
good luck with it and i think stock bifs would hold up too a stock engine and just mud but ur prob only gonna get 1st maby 2nd in low only with 5.29s but if ur staying stock axels might as well go with 5.71's too be just as weak there and the stock bifs least then u might and i mean might pull 1st and high with a healthy motor. but this is just my 2 cents
wish i still had the pics of his truck when it was together, its long been bashed and smashed and gone sence then.
good luck
adam
