I don't think a '70-'74 TH400 cross member is going to fit a '75-'81 subframe. Its going to be too narrow. The TH400 was no longer used after '74 so there is no factory cross member for the later frames. The only way is going to be with fabrication.
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1971 Trans Am 455 H.O. - Cameo white
1982 Recaro T/A 305 - Black
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