![]() Later units had a fixed-pitch converter and had a one-prong switch, the two-prong "pitch switch" was not used.Īnother way to identify the early variable-pitch units is by the transmission pan. This variable-pitch version of the TH400 was only used from 1965 to mid-1967. This converter could change its stall speed during use, based on an electrical impulse from a switch on the carburetor or accelerator pedal sent to a two-prong switch in the side of the transmission. The first-generation units were only used in Buick, Olds, and Cadillac, and incorporated a variable-pitch torque converter. TH400s were made in a couple of different versions, so knowing the year of the transmission is important to facilitate your being able to swap it into your car easily. One of the most appealing aspects of the TH400 is availability. Overseas manufacturers used these transmissions extensively as well, for use in their higher-performance powertrains. ![]() GM continued to use this unit in Chevrolet and GMC trucks into the Nineties. Used extensively by all GM divisions in the Sixties and Seventies, the TH400 was also commonly used by Jeep, Avanti and Checker for applications that required a sturdy automatic transmission. They also use about 8 more engine horsepower to power them, a TH350 typically uses about 36hp, as opposed to the TH400 using about 44hp. They are, for the most part, interchangeable on the same vehicles however, you would normally find the TH400 in larger engine applications because they are able to function more reliably at higher engine rpms. As automatics go, it is considered the heavy-duty version of the Turbo Hydra-Matic 350 they are similar in many characteristics. Hemmings Muscle Machines - DECEMBY JIM O'CLAIRĪ very interesting automatic transmission to consider, when replacing that tired old transmission or even upgrading an older unit like the Powerglide, is the Turbo Hydra-Matic 400. ![]() FEATURE ARTICLE from Hemmings Muscle Machines ![]()
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