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Every spring when I leave my 4-speed '70 in Florida and begin driving my '70 SS in Minnesota, I really miss the fun of shifting. I quickly learned that manually shifting my TH400 with the horseshoe shifter was a dicey proposition because there are no lock-outs between neutral and drive and second and low gears. Worst of all, when upshifting from low to second, it is easy to go too far and hit drive or even neutral. I had been thinking about installing a ratchet detent shifter plate in my horseshoe shifter but hadn't gotten around to it yet. When I recently acquired a Thomson Performace DT 4 ratchet detent plate for a 4-speed auto like the TH200 or TH700, I decided to see if I could make my own 3-speed version. It took ten hours and several hand and power tools but I was able to make a 3-speed detent plate out of 1/4" cold rolled steel plate. Since doing it, I would definitely recommend just buying the Thomson Performance DT 3 from Shiftworks for $75 + taxes & shipping (see shiftworks.com). This past Tuesday, I installed my homemade ratchet detent shifter plate in the horseshoe shifter of my '70 Monte Carlo SS454. Now I am shifting my TH400 manually whenever I want with no fear of missing a gear - I love it! As usual, I created a photo journal of the project that is already on Photobucket at this link: Installing a ratchet detent plate Here are a couple of photos from the project to prove it actually happened:
