General Motors 6L90-E Automatic Transmission

GM 6L90 6 Speed Automatic Transmission Specs & Information

The 6L90-E is a heavy duty version of GM's 6L80 designed for fullsize vehicles with a gross vehicle weight rating of up to 15,000 lbs and a gross combined weight rating of up to 21,000 lbs. The 6 speed automatic transmission features a modular transmission case design that accepts various bellhousings and output shaft adapters so that the transmission can be utilized in many applications without requiring extensive modifications or necessitate the need for complete application specific transmission designs. The 6L90 is found in Chevrolet Silverado HD and GMC Sierra HD pickups beginning with the 2007 model year. It is also used in the 2010 to current Chevrolet Express/GMC Savana 2500/3500 van series.

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
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
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

Source(s): & GM upfitter guide for applicable Silverado/Sierra 2500HD