A 400 Crossmember was made for a BB Chevy so the holes for the tranny mount are offset to match where BB motor mounts sit them closer to the pass. side..

If you measure the one you have, if the trans mount holes are in the center it's a SB one and if they're closer to the pass. side it's a BB/400 one..

I don't know for sure but expect BOP X-Body cars used a SB style center mounted trans mount?.

I believe either style crossmembers will work w/ all trans applications as long as you elongate the holes to the side or center for whichever engine mounting position you have?.

427carl wrote:

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Just to confirm, a 350 turbo in a Nova/Acadian has a straight, cross member, and a 400 turbo, has a cross memeber, with a curve in it? Carl

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Both my turbo 400's have the straight crossmember. The first picture.

here, look at these....
#3 is a turbo 350
#4 is the 400


-- Edited by 69 belair at 18:39, 2008-09-09