why are you all so stuck on the twin I beams,,,,,,,, if the truck weighed as much as a modern truck,,, or i was stupid enough to try to hall any thing of real weight with it,,, its 43 years old people,,,,, i want it to perform better,, a lot better,,, like a sports car,,,, haven't seen many I beams on them,,
mustangs nope
camaros nope
vipers nope
350z nope
evo8 nope
WRX nope

what has I beams,,, my 7,000 pound superduty,,, not very sporty,, not at all,,,,,,,,

im pretty sure having upper and lower control arms are the way to go,,,
im pretty sure rack&pinon steering will be better than a steering box,,,,
and the reason i used the mustang II frontend was i have found sites with full kits for it,,,,,

but thanks for all the help, and closed mindedness,,,,,