Turbo-Hydramatic 125

Turbo-Hydramatic Transverse Transaxle Series
A Hydra-Matic 3T40 transmission, produced between 1979 and 2001, at the Ypsilanti Automotive Heritage Museum
Overview
ManufacturerGeneral Motors
Production1979–2001
Body and chassis
Class3-speed transverse automatic transmission
RelatedTurbo-Hydramatic
Chronology
Successor4T40-E/4T45-E
4T60-E/4T65-E
4T80-E

The Turbo-Hydramatic 125 (modern designation 3T40) was the first in a line of automatic transmissions from General Motors designed for transverse engine application. Introduced in 1980 in the X-body and T-body (FWD) platform vehicles the units were used across all of GMs divisions worldwide, and was augmented by later automatic four speed transaxles, starting with the 44T-4 (4T60) which bore no internal functional resemblance to the original design 3 speed transaxle other than its basic chain driven 180-degree rotated version of its longitudinally mounted Stromberg THM 180 incarnation.

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