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Old 12-03-2019, 09:40 AM   #12
special-K
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Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,863
Re: 1972 Chevrolet K20 transmission crossmember for a turbo 400.

About a 1" body lift is needed when mounting a 67-72 body on a '73-'87 chassis. The frame rises up that much more in the area under the bed. The cab lift is required even just to have the body line up properly. GM used all room available with that extra space under the cab and the crossmember reflects that.

Your core support is moved back a couple few inches, too, with the ends of the frame cut off, correct? The newer frame is longer from cab forward. You engine should be less tucked into the firewall as well
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