8L45 8-Speed Transmission

REFINED TRANSFER
OF POWER

8L45 8-Speed GM Powertrain OEM Transmission
MAXIMUM ENGINE POWER:   308 Hp (230kw)*
MAXIMUM ENGINE TORQUE:  275 lb-ft (373 Nm)*

8L45 Features
& Specifications

Designed and built by GM, the 8L45 automatic transmission offers increased efficiency and lighter weight compared to the previous 6L45 Hydra-Matic six speed transmissions. With a wide 7.0 overall gear ratio, smaller steps between gears, and numerically higher 4.615 first gear, the 8L45 keeps the engine within the sweet spot of the rpm band for a greater feeling of immediate performance while making the most of its horsepower and torque to optimize performance and efficiency. Advanced features like Automatic Start/Stop, Grade Braking and Driver Shift Control (TAP Shift) are available based on application needs.

MAXIMUM ENGINE POWER: 308 Hp (230kw)*
MAXIMUM ENGINE TORQUE: 275 lb-ft (373 Nm)*
MAXIMUM GEARBOX TORQUE: 406 lb-ft (550 Nm)
GEAR RATIOS: M5N
FIRST: 4.615
SECOND: 3.038
THIRD: 2.065
FOURTH: 1.658
FIFTH: 1.259
SIXTH: 1.000
SEVENTH: 0.849
EIGHTH: 0.658
REVERSE: 3.928
MAXIMUM SHIFT SPEED: 7500 RPM
MAXIMUM VEHICLE WEIGHTS: Up to GCVW 12,000 lbs. (5,443 kg)*
RANGE SELECTOR QUADRANTS: 5 position (P, R, N, D, M) Protected for 6 position (P, R, N, D, M, L
CASE DESCRIPTION: 2-piece Main, bell integrated with main case
CASE MATERIAL: Die cast aluminum
SHIFT PATTERN: 2 on-off solenoids
SHIFT QUALITY: 6 variable force solenoids. One for each clutch and one for TCC
TORQUE CONVERTER CLUTCH: Variable Force Solenoid ECCC, 2 path, turbine damper
CONVERTER SIZE: 238 mm
FLUID TYPE: DEXRON™ High Performance ATF
FLUID CAPACITY: 10.8L*
TRANSMISSION WEIGHT: 80 kg (176 lb)*
PRESSURE TAPS AVAILABLE: C12345R Clutch
ASSEMBLY SITE: Toledo, OH and Silao, Mexico
*Based on 2020 Chevrolet Colorado Z71 2WD Crew Cab, Short Bed

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