GM 6L90 Transmission Ratios
| 1st | 2nd | 3rd | 4th | 5th | 6th | R |
| 4.027 : 1 | 2.364 : 1 | 1.532 : 1 | 1.152 : 1 | 0.852 : 1 | 0.667 : 1 | 3.064 : 1 |
GM 6L90 Automatic Transmission Specs
| Transmission | General Motors 6L90-E | |
| GM RPO Code | MYD | |
| Type | 6 speed automatic, rear wheel drive applications | |
| Production Plant(s) | GMPT Toledo, Ohio and GMPT Silao, Mexico | |
| Model Years/Applications | 2007 - current Chevrolet Silverado 2500HD/3500HD 2007 - current GMC Sierra 2500HD/3500HD 2010 - current Chevrolet Express 2500/3500 2010 - current GMC Savana 2500/3500 |
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| Case Material | Die cast aluminum | |
| Max Input Torque | 531 lb-ft | |
| Stall Ratio | 1.9 | |
| PTO Provisions | None | |
| Output Shaft | 29 spline | |
| Max GVWR | 15,000 lbs | |
| Max GCWR | 21,000 lbs | |
| Max Shift Speed | 6,200 rpm | |
| Weight | ~ 245 lbs w/ torque converter and ATF | |
| ATF Type/Spec | DEXRON VI automatic transmission fluid | |
| Fluid Capacity | ~ 13 quarts | |
| Transmission Filter P/N | ACDelco 24236933 | |
| Service Intervals | Change transmission fluid and filter at 100,000 miles under normal service conditions, 50,000 miles under "severe" service conditions | |
| Features | • 300 mm torque converter • Electronically controlled • Integrated tow/haul setting provides alternative shift schedule for high load conditions in addition to decent speed control features • Heavy duty version of the 6L80; 1 additional plate in each clutch pack, stronger input/output gearsets • Modular transmission design for easy integration between various engine applications |
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Source(s): www.gmpowertrain.com & GM upfitter guide for applicable Silverado/Sierra 2500HD