350 Turbo Transmission Specifications

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General Motors produced the TH350 or Turbo 350 three-speed automatic transmission to equip its Chevrolet, Buick and Pontiac cars beginning in 1969. GM usually paired the Turbo 350 with small-block Chevy engines, such as the 327 and 350 V-8s.

Identification

  • The Turbo 350 came encased in a one-piece aluminum alloy housing unit. It measured 21.75 inches long and weighed 120 lbs. GM installed a lock-up torque converter in 1979 through 1984 vehicles. An electrical plug on the driver’s side of the transmission identifies the lockup converter, according to Novak Conversions.

Specifications

  • GM introduced the Turbo 350 to replace the venerable Powerglide two-speed automatics. The Turbo 350 featured gear ratios of 2.52-to-1 for first gear, 1.52-to-1 for second and 1.00-to-1 for third. In contrast, the Powerglide had gear ratios of either 1.82-to-1 for first and 1.00-to-1 for second or 1.76-to-1 for first and 1.00-to-1 for second.

Uses and Versions

  • The Turbo 350 automatic found its way into Chevrolet Camaros, Pontiac Firebirds and Chewy and GMC trucks. Although the transmission most notably matched GM vehicles with small-block V-8s, it also matched the block-block 396 V-8s, V-6s and the small Iron Duke in-line four-cylinder models. GM also manufactured derivatives of the Turbo 350 with the smaller TH20, TH250 and TH375, which include lock-up torque converter models.

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