SuperMatic™ 8L90-E Eight-Speed Transmission Chevrolet Performance has adapted the production-based 8L90-E eight-speed automatic transmission for use with the LT1 and LT4 crate engines. A numerically high 4.56 first gear ratio offers strong take-off performance while a wide 7.0:1 overall ratio helps enhance cruising efficiency. Two versions are available: a slip-yoke design for use with the LT1 engine and a fixed-yoke design to be used with the LT4.
Additional highlights: • Four gearsets for greater efficiency • Five clutches – two brake clutches and three rotating clutches • World-class upshift speeds • Friction-reducing features include synthetic fluid • Gear ratios: 1st: 4.56, 2nd: 2.97, 3rd: 2.08, 4th: 1.69, 5th: 1.27, 6th: 1.00, 7th: 0.85, 8th: 0.65, reverse: 3.82 • Controller and harness included • Torque converter included (engine specific)
SuperMatic™ 8L90-E Transmission for LT1 crate engine (slip yoke) • Use with LT1 crate engines P/N 19328728 (wet sump) or P/N 19329997 (dry sump) • Includes torque converter, controller and harness • Must be used with compatible engine controller (P/N 19355167)