if your trans guy is recommending TCI..... I'd find a new trans guy smile (just kidding..... well, kind of :)) Dave also makes the lever so you can use the factory N safety switch if that's what you are doing.... that way it will only crank in P and the last N. I used that with my Turbo Action shifter, but am now using the switches on the PPP shifter which is set up the same way. Dave's brake will also require the accumulator to be in place... the Griner brake doesn't require that. Just fyi....