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Am almost finished with my 402/350 install. Truck is a 72 Cheyenne LWB 2WD. Was a 350/350 originally. Had no problem with the lower hump. I installed a B&M shifter and there is enough room to put my hand between the tranny and the floor to start the nuts on the attachment bolts. I can't speak for the TH-400 however. Good luck.
Larry
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