[Shelboss]

I didn't have drawings to go by, only pictures. The later cars use a 3" diameter crossmember and a 4 bolt flange, .25" thick. Our cars use a 3.5" crossmember so I used a 3 bolt flange and positioned the bottom bolt straight down, the top needs to clear the floor. I marked the tubes halfway between the 4" main tubes and the transmission vertical supports, then made a cutting jig out of a band clamp and some tubing cut in half and cut the tube with a sawzall. Don't be alarmed when the main tubes relax a little, mine were stressed by the crossmember welding at the factory. I then squared up both ends of the cuts, which also adds clearance pre-flanged. I used three threaded rods and nuts to fixture the flanges on to the crossmember that I just cut out, it is important to get these square otherwise you will have trouble getting it back in later. Then welded all around. Now you can put it in place and bolt the outer flanges to it. With a jack under the transmission, level the trans mount to the transmission crossmember surface and weld it in place. I will post pictures that I find in my gallery, good luck!