#700r4 auxiliary valve body function series
Other auto manufacturers have used the THM400 and its 4L80E successor, including Ferrari (in the 400/412) Jaguar/Daimler (in pre-1994 XJ12 and XJ-S coupes) and their Daimler stable mates Rolls-Royce (in 1965–1980 Silver Shadow and 1980-1992 Silver Spirit series cars, along with their Bentley stable mates) the Nissan Prince Royal AM General and Jeep (usually found in the FSJ pickups and SUVs). Checker Motors Corporation Motor Company used the Chevrolet version of the THM400 for its 'A' series taxi and Marathon models until the end of production in 1982. The THM425 front wheel drive transmission shares almost all its internal parts with the THM400. There is no externally visible way to determine whether the transmission contains the straight-cut planetary gear set. The 3L80HD has a straight-cut planetary gear set. Another variant is the 3L80HD, often referred to as a Turbo 475.
Some 'Heavy Duty' THM350s were also designated THM375-B. It is a THM400 Chevrolet bolt pattern case that has a longer 27 spline output shaft and matching extension housing with 'TH375' cast into the housing. Somewhere in the Mid-80's Chevrolet C10 Pickups could also come equipped with a THM375.
THM375s were found in some 1971-76 Buick Lesabres and Oldsmobile Delta 88s with the 5.7 liter V-8. Internally the clutch packs originally had fewer friction plates. It can be identified by '375-THM' cast into the tailhousing. All THM400 units had a 32 spline output shaft with the exception of the THM375 that used a 27 spline output.Ī variant of the THM400 known as a THM375 is a THM400 with a mid length 27 spline output shaft that mates to the smaller THM350 27 spline drive shaft yoke. Other units to include the 2 prong connectors had an internal pressure switch that was used to control spark timing retard. This transmission (among other THMs) is identified by the 'Park R N D L2 L1' selector quadrant.The switch pitch is not the only THM400 that utilizes an external 2 prong connector. GM used a Switch Pitch torque converter in the Buick twin turbine Dynaflow transmission between 1955–1963 and the Super Turbine 300 two speed transmissions used by Oldsmobile, Pontiac (Pontiac's ST300 didn't have a switch pitch), and Buick divisions between 1964-1967. Externally the switch pitch version has two electrical connections, where the non-switch pitch THM400 has only one. These can be identified outside the vehicle (with the torque converter removed) by a narrow front pump spline. Many of the Buick, Cadillac, and Oldsmobile THM400s produced between 1964-67 were equipped with a 'Switch-Pitch' torque converter with a variable-pitch stator, which is 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.
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