SuperMatic 8L90-E Transmission for LT4 Crate Engine

Brand: Chevrolet Performance

Part Number: 24284063

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NEW 8L90-E EIGHT-SPEED AUTOMATIC TRANSMISSION FOR LT1 AND LT4 CRATE ENGINES

When it comes to world-class performance and technology, the Corvette and Camaro run with the best. Their advanced Gen V Small-Block LT4 engines are among the most power-dense in the industry and they’re offered with equally sophisticated transmission technology in the 8L90-E eight-speed automatic.

Best of all, unique algorithms enable the 8L90-E to deliver shift performance that rivals the quickest dual-clutch/semiautomatic transmissions found in many supercars – but with the smoothness and refinement that comes with a conventional automatic fitted with a torque converter.

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 (P/N 24284055) and a fixed-yoke design to be used with the LT4 (P/N 24284063). Each version includes the torque converter, controller and harness.

 

Chevrolet Performance has adapted the production-based 8L90-E eight-speed automatic transmission for use with the LT1 and LT4 crate engines.

  • Use with LT4 crate engines P/N 19332621 (wet sump) or P/N 19332702 (dry sump).
  • Includes torque converter, controller and harness
  • Must be used with compatible engine controller
  • 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: 3.8