Here is my opinion on these O/D transmissions. You need to take into consideration your Driving style, Speed limits, Engine rpm which I think is the most important, Rear gear, and Tire size. Where is most of your driving gonna be, on the highway or around your City or Town. I guess if you want the best of both worlds you could move up to the T56 with 6 speed and two O/D's.
I was gonna go with the .72 O/D but that first gear ratio of 3.27 was no good for my setup. A good Friend of mine that is much better than myself with numbers talked me out of it. and he was right. I'm very happy with my current setup.
Anyhow, point is that one size doesn't fit all. Find yourself a rpm,tire calculator online and go from there.
https://purperformance.com/p-29669-rpm-calculator.html
I'm running the new TKX with .81 O/D, 275/60R/15 tire, and 3.73 rear gears. My engine like to cruise at around 2200 rpm. The after market shifter I went with is from Modern Driveline. It uses bellville washers for centering the shifter which I'm very impressed with. https://www.moderndriveline.com/shop...y-rear-socket/
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 9.95@134 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
Last edited by chuckies76ta; 05-07-2023 at 07:02 AM.
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