Note: GM had also used a Switch Pitch in the 1955–1963 Buick twin-turbine Dynaflow and the 1964-1967 two-speed Super Turbine 300 used in Buick and Oldsmobile (Pontiac's ST300 didn't get the SP). A Switch Pitch can be identified outside the vehicle (with the torque converter removed) by a narrow front pump spline. A SP THM400 always has an external 2 prong connector, whereas a non-SP may have one or two (mostly one, except two on vehicles equipped with an internal pressure switch for spark timing retard). Many of the BOC (Buick, Oldsmobile, Cadillac) THM400s produced between 19 were equipped with a variable-pitch stator torque converter called " Switch-Pitch" (SP) these are sought after by collectors and drag racers. The following year, application expanded to Oldsmobile and Pontiac and to some full-sized Chevrolets. First introduced for the 1964 model year under the name "Turbo Hydra-Matic" in Cadillacs and "Super Turbine" in Buicks. The THM400 can be visually identified by an oil pan number four shown at General Motors Transmission Pans. Super Turbine 400 / THM400 / THM375 / 3L80 / 3L80HD Turbo-Hydramatic 400 Transmission Starting in the early 1980s, the Turbo-Hydramatic was gradually supplanted by four-speed automatics, some of which continue to use the "Hydramatic" trade name.Īlthough the Turbo Hydra-Matic name alludes to the original Hydra-Matic developed by General Motors' Cadillac division in the late 1930s, the two transmissions were not mechanically related. By 1973, THM units had replaced all of GM's other automatic transmissions including Chevrolet's Powerglide, Buick's Super Turbine 300, and Oldsmobile's Jetaway. The Buick version, which followed shortly thereafter, was known as the Super-Turbine 400. In its original incarnation as the Turbo-Hydramatic 400, it was first used in the 1964 model year in Cadillacs. The Turbo-Hydramatic or Turbo Hydra-Matic (THM) series was developed to replace both the original Hydra-Matic models and the Buick Dynaflow. These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse. Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. ![]() The filter bolts on to the valve body so no filter supports or extensions are needed.3-speed longitudinal automatic transmission The low profile pan, PML part number 9589 has the external bosses that may interfere with the drive shaft on some vehicles. PML also offers a low profile version of this pan for vehicles that need more ground clearance. These interfered with the drive shaft on some vehicles. PML moved the drain plug and optional temperature sending bosses in 2014. It first appeared in cars in 1969 and continued in production in the 1980s. The TH350 transmission is called Turbo 350 in the racing field and is formally called THM350 for Turbo-Hydramatic 350. ![]() The pan has a boss that can be machined for a temperature sensor. For example, this transmission was originally on 1967 to 1972 El Caminos, Blazers, and C/K 20 trucks and Suburbans. The TH350 transmission is found in GM (Chevy, Cadillac, Olds, Buick) vehicles as well as retrofitted Jeeps and other cars and trucks. The transmission was first available in 1969 after joint development by Buick and Chevrolet. This PML pan fits cars and trucks with the GM TH350 (Turbo-Hydramatic 350) transmission. ![]() PML transmission pans feature sand-cast aluminum construction with raised fins, thick walls to add strength to the transmission case, and a machined gasket surface for a secure seal. # 9684-AC Transmission Pan, GM TH350, PML #9684-AC Deep As-Cast
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