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Turbo-Hydramatic 425/325/325-4L
Overview
Manufacturer General Motors
Production 1966–1985
Body and chassis
Class 3-speed longitudinal automatic transmission
Related Turbo-Hydramatic 125
Turbo-Hydramatic
Turbo-Hydramatic 180
Chronology
Successor 4T60

Turbo-Hydramatic 425 (and 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. The internal parts spin the opposite direction in the THM425; the helical angle of the planetary gears is "reversed" and the one-way clutches freewheel in the opposite direction, for example. The THM425 was developed for the 1966 Oldsmobile Toronado and the 1967 Cadillac Eldorado. A lighter-duty transmission known as the THM325 replaced the THM425 in both car lines after the 1978 model year. 1979 and later longitudinal engine front-wheel drive vehicles used the THM325. The THM325 became the THM325-4L with an overdrive added in 1982, but all vehicles using this transmission switched to more-conventional transverse engine mounting in 1986.

Applications:

See also[edit]

/wiki/Cadillac_Eldorado


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Turbo-Hydramatic_425 — Please support Wikipedia.
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