Well, that’s what I get for thinking that I could adjust the height of the crossmember during installation! I need around another 2 inches of clearance at the top to clear the transmission. I made a paper pattern of what I already constructed and added 2 inches on the pattern to both sides. The very top of the crossmember also needs to be shortened since the sides are going to be lengthened. Got it all assembled and welded together and test fit to the transmission - plenty of room to the sides and top of the transmission.
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To fabricate the lower transmission support I think it will be prudent to assemble the transmission to the motor and motor to the K Frame so that the exact front to back transmission relationship to the new lower support is exact.
Next is to start fabricating a new tunnel. For ease of fabrication I think it will need to be constructed in several sections and welded together.