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The 200-4R was introduced for the 1981 model year. Some components [vague] [which?] which were prone to failure in the THM200 were improved, and in the later 1980s, this transmission was used with high-power applications — primarily the Buick Grand National and the 1989 Pontiac Firebird Trans Am Indy 500 Pace cars. The 200-4R was configured ...
From 1981 through 1990, the THM200-4R 4-speed automatic with overdrive was added, as GM added a lock-up torque converter and a 0.67:1 overdrive ratio. With the overdrive transmission, the Custom Cruiser drive with a numerically higher rear axle ratio for better performance, while offering improved fuel economy with the overdrive range
The 1985 4-4-2 used an OZ code THM 200-4R transmission (as did the 1983–84 Hurst/Olds). Both 1986 and 1987 4-4-2 used the KZF code THM 200-4R. The KZF removed much of the shift harshness of the original OZ coded transmissions, but were still firmer than the run-of-the-mill overdrive transmissions used in the rest of Oldsmobile's lineup.
For 1981, the Oldsmobile 307 V8 replaced the Buick 350. The 4.1 L V6 and 307 V8 engines were paired with the new 4-speed THM200-4R automatic transmission, which used a lockup torque converter and a 0.67:1 overdrive ratio. With this new transmission, the Electra could be equipped with a numerically higher rear axle ratio for better performance ...
4-speed THM200-4R automatic 1977 Buick LeSabre Custom Landau The 1977 Buick LeSabre and other GM B-body full-sized cars were considerably smaller on the outside and lighter than their predecessors, losing 700-800 pounds of weight and 10 to 15 inches (250 to 380 mm) of overall length.
Turbo-Hydramatic 425 (TH425 or THM 425, [1] 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 ...
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