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TH350 Turbo Hydra-Matic Automatic™ Transmission - RPO M38 (Group 4.003)
The Turbo Hydra-Matic 00 (TH350) three-speed transmission was developed by GM and first found its way into Chevrolets in 1969 but was installed in several late 1968 model year Chevelles. The Turbo Hydra-Matic 350 was designed as an alternative automatic for the venerable two-speed Powerglide. The TH350 was available with any small block V8 engine.
It was developed jointly by Buick and Chevrolet to replace the two-speed Super Turbine 300 and aluminum-case Powerglide transmissions. So, although it carries the Turbo Hydra-Matic name, the Hydra-Matic Division of General Motors had little, if anything, to do with its design. The 350 and its 250, 250C, 350C and 375B derivatives have been manufactured by Buick in its Flint, Michigan plant, and by Chevrolet in Toledo, Parma, Ohio and Windsor, Ontario.
To see just what TH350 automatic transmissions were used behind which specific 6- and 8-cylinder engines, see my Chevelle Facts Guide CD.
Typical TH350 oil pan
Turbo Hydra-Matic 350 assembly plants include Cleveland, OH. (C), Toledo, OH. (T), and McKinnon Industries, St. Catharines, ON. (E) and they varied model years.
| 1969 | 1970 | 1971 | 1972 |
| Cleveland, OH (X - prior to 8/12/68) Cleveland, OH (B - after 8/12/68) Toledo, OH (Y) |
Cleveland, OH (B) Toledo, OH (Y) |
Cleveland, OH (B) Toledo, OH (Y) |
Cleveland, OH (B) Toledo, OH (Y) |
Partial VIN Stamping
Partial VIN stamping on a 1972 Arlington TH350.
