tough call. i think in the eighties there were some heavy duty 3/4 tonne trucks that had heavy duty dana 44 in front with leaf springs and not the TTB. in the seventies they used coil springs on the dana 44. either on the small bronco, big bronco, or f150. i think if you go back to the early seventies and in the sixties there would be some closed knuckle dana 44's with leaf springs. your best bet would be to look for the front dana 44 from a seventies small bronco, i think the coil mounts were removable from the axle. then you could mount your own leaf spring mounts. or you use a coil front suspension with radius arms and trakc bar like the ford was set-up. or, you order a built dana 44 from aftermarket, dynatrac, currie, mopar.