SuperMatic 8L90-E for LT1
8-speed performance that is perfectly matched to the LT1 engine
Chevrolet Performance has adapted the production-based 8L90-E 8-speed automatic transmission for use with the LT1 crate engine. 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, or a fixed-yoke design for use with the LT4 engine.