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Buick-Oldsmobile-Pontiac Assembly Division was a designation applied from 1933–1965 to a group of factories operated by General Motors. The approach was modeled after the Chevrolet Assembly Division where cars were assembled from knock down kits originating from Flint Assembly and a collection of sites Chevrolet used before the company became a part of General Motors in 1917.
From 1964-1967, Buick and Oldsmobile versions of this transmission used a torque converter with a variable-pitch stator called Switch-Pitch (by Buick) or Variable Vane (by Oldsmobile). The stator blades moved from high to low position by an electrical solenoid and a stator valve , controlled by a switch on the throttle linkage.
The GM B platform was introduced in 1926 with the Buick Master Six, and the Oldsmobile Model 30, and had at least 12 major re-engineering and restyling efforts, for the 1937, 1939, 1941, 1949, 1954, 1957, 1959, 1961, 1965, 1971, 1977, and 1991 model years; along with interim styling changes for 1942, 1969, and 1980 that included new sheetmetal and revised rooflines.
The original program was intended to replace all midsize cars produced by Chevrolet, Pontiac, Oldsmobile, and Buick on the G and A platforms. This ultimately did not happen; while the A-platform Chevrolet Celebrity and Pontiac 6000 were quickly discontinued, the A-body Buick Century and Oldsmobile Cutlass Ciera remained in production until 1996.
Like all other GM divisions, Olds continued building its own V8 engine family for decades, adopting the corporate Chevrolet 350 small-block and Cadillac Northstar engine only in the 1990s. All Oldsmobile V8s were assembled at plants in Lansing, Michigan while the engine block and cylinder heads were cast at Saginaw Metal Casting Operations.
Turbo-Hydramatic 425 (TH425 or THM 425, [1] later 325) was an automatic transmission developed and produced by General Motors.The THM425 was a derivative of the THM400; most parts directly interchange and some others will interchange with minor modifications.