Introduced in the model year of 1982, the GM TH700R4 is a four-speed automatic transmission in an aluminum die-cast case. The transmission remained in production until 1993 and saw several changes and improvements, such as the introduction of electronic controls and solenoids and an increase in the number of splines in the input shaft from 27 to 30.
GM introduced the Turbo-Hydramatic (TH) 700R4 automatic transmission in 1982 Chevrolet vehicles, replacing three-speed models in trucks and larger cars. It came in models that could be bolted onto small block or big block engines. In addition, the transmission was available in two-wheel and four-wheel drive versions. The gearing of the 700R4 is 3.06 for first, 1.63 for second, 1.00 for third, 0.70 for fourth and 2.29 for reverse gear.