Like the TH400, it has three forward gears, but not as much rotating mass. Zack Farah: The TH350 is a great compromise between the TH400 and Powerglide. Let’s get schooled on what goes into a thoroughbred drag transmission, shall we? Beattie Jr., Rick Hults, and Jim Beattie Sr. Our panel includes Stan Poff of TCI Automotive Zack Farah of Gearstar and Rob Sappe, J.C. Building the perfect drag automatic is a balancing act among durability, efficiency, and low mass, so to learn more about them we consulted with some of the most well-known trans builders around. In applications that require the ultimate in durability, Powerglides and TH400s have always been the gold standard, but which is best for your application? Furthermore, thanks to the demands of Super Stock racers that bite and claw for every fraction of a horsepower, modern TH350s can now survive behind 900-plus horsepower motors, which was unheard of just 10 years ago. That’s because street transmissions make an excellent foundation for drag race transmissions, and since long before the muscle era GM has dominated the market. Whether the race cars in question are street/strip machines, Chevys, Fords, Mopars, Top Alcohol dragsters, or 3,000hp Outlaw 10.5 beasts, when it comes to drag racing transmissions it’s GM or bust. Just like a quick stroll through the cruise night parking lot will confirm the dominance of GM overdrive automatics on the street, walking down the staging lanes of any dragstrip will reveal an equally overwhelming number of Powerglides and TH400s.
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