we are actually making 3 of these...one tundra v8/automatic, one 22r 5 speed and one 5 speed ls-1/truck bodied...Supra diffs on the v8 cars, IFS 7.5 on the 22r propane powered one....im making new hub/spindle design right now...my car uses the torsions with 3 tube by-pass/emusion/air bump...22r car uses torsions as well...with bilstein 5100 shocks.