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Turbo-Hydramatic 425/325/325-4L
Ypsilanti Automotive Heritage Museum May 2015 057 (1965-78 THM 425 transmission).jpg
A THM 425 transmission, produced between 1965 and 1978, at the Ypsilanti Automotive Heritage Museum
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.

A THM 325 transmission, produced between 1978 and 1985

Applications:

See also[edit]


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

autoevolution

autoevolution
Tue, 29 Mar 2016 10:42:34 -0700

The thing that lets the Vector W8 down is the Turbo-Hydramatic 425 three-speed tranny. This slushbox had been first used by the 1966 Oldsmobile Toronado and the 1967 Cadillac Eldorado. Porsche 911 GT1 Strassenversion Of the 144 races it entered, the ...

Super Chevy (blog)

Super Chevy (blog)
Wed, 07 Oct 2015 05:22:30 -0700

The unique disc brakes used fixed calipers and dual rotors to double the braking surface that gripped from the inside of the rotors. The transverse-mounted engine used a six-speed automatic transmission that used two Turbo-Hydramatic 425 transmissions, ...
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