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For 50 years, Chevrolet Performance has supplied performance engines and products to car enthusiasts all over the world. All crate engines, transmissions and performance parts are designed, developed and tested by Chevrolet.SuperMatic™ 4L85-E Four-Speed ​​TransmissionImproved valve body for firmer shifts,Direct bolt-on for Gen I Small-Block and all Big-Blocks,Does not include torque converter,Includes additional clutch plates,Gear ratios: 1st: 2.48, 2nd: 1.48 , 3rd: 1.00, 4th: 0.75, Add up to 690 lb.-ft. torque, NOTE: Use with electronic controller P/N 19332780 for carbureted and Ram Jet applications. Use with electronic controller P/N 19302410 with Chevrolet Performance LS fuel injected applications. Torque converter not included.