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Just thinking out loud here, but one way to deal with that is to run an IRS and have the center section solid to the unibody. It would not be a wheelie machine or a dragstrip terror, but you could make it handle.



3rd Gen Supras ('86.5-'92) are IRS rears mounted on subframes which have the whole shebang - pumpkin, suspension, a-arms, springs, struts, the works. Might not be too difficult to adapt to the existing structure. And the rear end is quite stout. LSDs can be found and gears available are 3.73, 3.91, or 4.30. Some guys have run 600HP at the crank through that diff.

Probably wouldn't be too hard to find, since most of those cars are wrecked in the front.