Turbo-Hydramatic 440-T4
The model THM440T4 indicates Turbo HydraMatic Model 440, Transversely Mounted, 4 Speed Fully Automatic transaxle.
A 4-speed transaxle which replaced the 125, was created for the 1985–1986 GM C platform (FWD)/GM H platform (FWD) cars, the Turbo-Hydramatic 440-T4. Virtually no internal parts were shared with the 125, and overdrive was achieved by departing radically from the standard single Simpson compound planetary gearset's common sungear layout. This transaxle was first used in GM's 1985 Buick Park Avenue, Oldsmobile 98, and Cadillac Deville. In 1986, after switching to FWD, the Buick LeSabre, Oldsmobile Delta 88, and later, the Pontiac Bonneville also used this transaxle. The 440-T4 was later renamed the 4T60 under GM's new transmission naming convention. A version of the 4T60 called the 4T60-HD, which incorporated upgraded final drive hardware but was otherwise mechanically indistinguishable from standard units, was used in the 1989-1990 Pontiac Grand Prix with the turbocharged engine. GM started adding electronic controls to the 4T60 in 1990 with the Cadillac Allanté carline's unique F7, and 1991 and after with the corporate 4T60-E.
One unique feature of this transmission is its use of both a modulator valve and a throttle valve (TV) cable. Most transmissions either use one or the other to control shift points and shift smoothness. On the Turbo 440-T4, the TV cable exclusively controls the shift points, while the modulator valve controls the shift feel, with very little overlap between the effects of one adjustment on the other. This feature makes it very easy for a do-it-yourself mechanic to adjust the transmission shift points with minimum effect on the shift feel.
The 440-T4 was originally slated to be used with downsized C-Body cars for 1984. However, issues with failures due to lack of fluid lubrication to critical clutch train parts in the relatively complex and compact design, led to the introduction of transverse FWD 4-speed automatics being delayed as an option until 1984 for the 1985 model year.
Applications:
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