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Jaime Pacheo helped us with the swap. We had previously drilled new crossmember holes in the frame to mount the TH400 (using a TH350 crossmember). Since the 200-4R trans mount is in the same location as the TH400, it bolted right up. In early Camaros, we've had to trim part of a TH400 crossmember to clear the trans pan, but it bolts right in. Just so you know, the rear trans mount bolts in a 200-4R are metric, at M10 x 2.5.