I've been conjuring up a bracket to mount a dual mc using the stock pedal. The brackets for sale from various folks will not work due to clearance issues with the transmission linkage on the hydramatic, and I think also the three on tree speed.
Not very speedy, inventing the wheel, but I think what I ended up with may work well. Bolter Bill Miles sent me photos of his setup with a '53 hydramatic gmc, but I think the '54 frame & stock mc bracket may be different so I built my own. I think the vendor brackets may only be good for 4-speeds with floor shifters.
I started by;measuring the stock mc, and using these measurements located the new mc bracket about an inch back from the existing ;mc frame bracket. The stock mc has a special tapped flatbar (grade 8) which uses two 7/16" bolts to attach the mc. I drilled a piece of flatbar using the same centers which welds to a new angle bracket which bolts to the frame and extends inward with a surface large enough to mount the new mc. In this setup, the old clevis is used with the stock pedal and a longer rod is fabricated. There was a 7/16" hole in the bottom flange of the frame about eight inches farther back. I used a piece of two inch flat stock mitered to fit the required angle with a hole to bolt through the frame. This was then welded to the bottom of the new angle bracket. It's a very tight fit with a hydramatic, but everything looks okay so far. The bracket is now welded and ready to install with the correct grade 8 bolts and the new mc, a big hulk compared to the old one.
I'll try to post some pictures if anyone is interested. I have the vendor bracket, stock mc, and new fabbed bracket with new mc all together on my tailgate will try to shoot that so you can see how the changes were figured out.
