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Apr 10, 2015 · Discussion Starter · #2 · Apr 10, 2015. Reprogramming Procedures for the 8L90 8-Speed Transmission. “Several reprogramming procedures must be performed after replacement of some components on the new 8L90 8-speed transmission available on the 2015 Corvette, Silverado, Sierra, Yukon, Yukon XL, and Escalade. These procedures are covered in .... The 8L90 transmission contains a. Information about GM's 8-speed 8L90 M5U Hydra-Matic transmission, including details, The Hydra-Matic 8L90 (production code M5U) is a fuel-saving and For performance driving in the Corvette, the transmission offers full manual control via steering . ... Available to order now, our Gen 5 V8 standalone swap.