8L45 8-SPEED TRANSMISSION
REFINED TRANSFER OF POWER
MAXIMUM ENGINE POWER: 308 HP (230 KW)*
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 (230 kW)*
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