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There was also a choice between a three-speed automatic transmission, the Turbo-Hydramatic TH350, or one of two fully-synchronized manual transmissions: a three-speed, or a four-speed , which included a "granny gear" low-ratio 6.55:1 first gear. [5] The 350 was offered only with the SM465 or TH350; manual locking front hubs were optional. [3]
The Turbo Hydra-matic 350 was first used in 1969 model cars. 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.
This was Chevrolet's second 4.3L power plant; four other Chevrolet engines displaced 4.3L: the Vortec 4300 (a V6 based on the Chevrolet 350 cu in (5.7 L), with two cylinders removed), the original 265 cu in (4.3 L) V8 in 1954, a bored version of the stovebolt-era 235 inline six displacing 261 cu in (4.3 L), and a derivative of the Generation II ...
The standard powertrain was the 350 cu in (5.7 L) Chevrolet "Turbo-Fire" small-block V8 with a two-barrel carburetor, rated at 250 hp (190 kW; 250 PS) (gross) at 4500 rpm and 345 lb⋅ft (468 N⋅m) of torque at 2800 rpm, mated to a column-mounted 3-speed Synchro-Mesh manual transmission.
For 1968, Chevrolet enlarged the 283 V8 to 307 cubic inches. A 396 cubic-inch V8 became an option (the first time a large-block V8 was offered in a light-duty GM truck). [14] For 1969, Chevrolet enlarged the 327 V8 to 350 cubic inches. For 1970, GMC phased its V6 engines out of light trucks, switching entirely to Chevrolet-produced engines. [15]
After improvements to the intake and exhaust manifolds in 2001, the rating improved to 350 hp (261 kW) and 365 lb⋅ft (495 N⋅m) (375 lb⋅ft (508 N⋅m) for manual-transmission Corvettes. [ 45 ] [ 46 ] The LS1 was used in the Corvette from 97 to 04.