Why bother? putting a B2 body on a Chevy frame has nothing to do with what the OP was asking about.
actually it has everything to do with it since i have a broncoII, with 63" leaves. my front body mounts sit directly over my spring shackle. it has nothing at all to do with what frame the body sits on, i still encountered the exact same problem........and solved it
but i guess you are speaking on behalf of the op and therefore denying him my
pertinant info
just because the two "C"-shaped rails were stamped out in a gm factory not ford, are no more than 1" difference in spacing, the exact same diameter channel (6" i.d.), identical wheelbase........how about you go ahead and back up your original statement. and tell me how mine is different
**edit here are pics (if its okay with COPYKAT)
as i said my body mount sits directly over the shackle so i got from my local steel shop 2 4"x4"x3/16" plates and had them shear one diagonally and used the triangles to gusset the flat top. and then trimmed the one side to allow the shackle to swing outward. this mount's open underside doesn't interfere with the shackle like the stock bII would here it is with a stck bII rubber body isolator:
maybe you could use the shackles from the chevy those 4 rivets in the pic hold the shackle on the other side of the frame-rail but welding or grade8 bolts instead of rivets will be just as strong if not stronger
