Re: V8 Swap
as a heavy duty mechanic I can tell you the removeable cross member idea is common. it keeps the frame rails width apart dimensionally correct. sometimes I would cut a length of 2x4 to use as a wedge to get the frame rails spread apart a bit to remove/repace the cross member and get the bolt holes lined up. anyway, just saying don't write off the idea but also think about the cab weight tending to spring the frame rails when the support from the original cross member is gone.
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