Turbo-Hydramatic 425
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Turbo-Hydramatic 425 (TH425 or THM 425, later 325) was an
automatic transmission An automatic transmission (AT) or automatic gearbox is a multi-speed transmission (mechanics), transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions. The 1904 ...
developed and produced by
General Motors General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. The company is most known for owning and manufacturing f ...
. 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 The Oldsmobile Toronado is a personal luxury car manufactured and marketed by the Oldsmobile division of General Motors from 1966 to 1992 over four generations. The Toronado was noted for its transaxle version of GM's Turbo-Hydramatic transmissi ...
and the 1967
Cadillac Eldorado The Cadillac Eldorado is a luxury car manufactured and marketed by the Cadillac Motor Car Division of General Motors from 1952 until 2002, over twelve generations. The Eldorado was at or near the top of the Cadillac product line. The original ...
. A lighter-duty transmission known as the THM325 (using components sourced from the THM200) replaced the THM425 in both car lines after the 1978 model year. 1979 and later
longitudinal engine In automotive engineering, a longitudinal engine is an internal combustion engine in which the crankshaft is oriented along the long axis of the vehicle, from front to back. See also: transverse engine Use This type of motor is usually used fo ...
front-wheel drive Front-wheel drive (FWD) is a form of internal combustion engine, engine and transmission (mechanics), transmission layout used in motor vehicles, in which the engine drives the front wheels only. Most modern front-wheel-drive vehicles feature ...
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 A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. Many modern front-wheel drive vehicles use this arrangement. Most rear-wheel drive vehicles use a longitudinal ...
mounting in 1986. Bellhousing pattern used the 1967-90 Buick-Oldsmobile-Pontiac-Cadillac V8 pattern throughout its entire lifecycle. Applications: * THM425 ** 1971–1979 Cortez Motor Home ** 1966–1978
Oldsmobile Toronado The Oldsmobile Toronado is a personal luxury car manufactured and marketed by the Oldsmobile division of General Motors from 1966 to 1992 over four generations. The Toronado was noted for its transaxle version of GM's Turbo-Hydramatic transmissi ...
** 1967–1978
Cadillac Eldorado The Cadillac Eldorado is a luxury car manufactured and marketed by the Cadillac Motor Car Division of General Motors from 1952 until 2002, over twelve generations. The Eldorado was at or near the top of the Cadillac product line. The original ...
** 1973–1978 GMC Motorhome ** 1973–1978 GMC TransMode multi-purpose vehicle ** 1972–1978 Revcon motorhome ** 1989–1993
Vector W8 The Vector W8 is a sports car produced by American automobile manufacturer Vector Aeromotive Corporation from 1989 to 1993. It was designed by company founder and chief designer Jerry Wiegert while receiving refinements by Vector's head of engi ...
* THM325 ** 1979–1981
Cadillac Eldorado The Cadillac Eldorado is a luxury car manufactured and marketed by the Cadillac Motor Car Division of General Motors from 1952 until 2002, over twelve generations. The Eldorado was at or near the top of the Cadillac product line. The original ...
** 1979–1981
Oldsmobile Toronado The Oldsmobile Toronado is a personal luxury car manufactured and marketed by the Oldsmobile division of General Motors from 1966 to 1992 over four generations. The Toronado was noted for its transaxle version of GM's Turbo-Hydramatic transmissi ...
** 1980–1981
Cadillac Seville The Cadillac Seville is a mid-size luxury car manufactured by Cadillac from the 1976 to 2004 model years as a smaller-sized, premium model. It was replaced by the STS in 2004 for the 2005 model year. Origin of the name The name of "Cadillac's ...
* THM325-4L ** 1982–1985
Buick Riviera The Buick Riviera is a personal luxury car that was marketed by Buick from 1963 to 1999, with the exception of the 1994 model year. As General Motors' first entry into the personal luxury car market segment, the Riviera was highly praised by au ...
** 1982–1985
Cadillac Eldorado The Cadillac Eldorado is a luxury car manufactured and marketed by the Cadillac Motor Car Division of General Motors from 1952 until 2002, over twelve generations. The Eldorado was at or near the top of the Cadillac product line. The original ...
** 1982–1985
Cadillac Seville The Cadillac Seville is a mid-size luxury car manufactured by Cadillac from the 1976 to 2004 model years as a smaller-sized, premium model. It was replaced by the STS in 2004 for the 2005 model year. Origin of the name The name of "Cadillac's ...
** 1982–1985
Oldsmobile Toronado The Oldsmobile Toronado is a personal luxury car manufactured and marketed by the Oldsmobile division of General Motors from 1966 to 1992 over four generations. The Toronado was noted for its transaxle version of GM's Turbo-Hydramatic transmissi ...


See also

*
Cadillac Eldorado The Cadillac Eldorado is a luxury car manufactured and marketed by the Cadillac Motor Car Division of General Motors from 1952 until 2002, over twelve generations. The Eldorado was at or near the top of the Cadillac product line. The original ...
*
List of GM transmissions General Motors (GM) is an American car designing and manufacturing company. It manufactures its own automobile transmissions and only occasionally purchases transmissions from outside suppliers as needed. GM transmissions are used in passenge ...


References

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External links


Troubleshooting manual
(1969) General Motors transmissions