8L45 HYDRA-MATIC 8-SPEED AUTOMATIC TRANSMISSION

REFINED TRANSFER
OF POWER

8L45 8-Speed GM OEM Hydramatic Transmission front side view
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

CONTACT US

Become A
Partner

GM PRIVACY STATEMENT

This contact form is intended for current and prospective U.S. and international business customers in search of GM engine and/or transmission solutions. If you are looking for parts, service, or GM vehicle support, please click here.

This contact form is intended for current and prospective U.S. and international business customers in search of GM engine and/or transmission solutions. If you are looking for parts, service, or GM vehicle support, please click here.

* indicates a required field