1SZ 3.73 rear axle ratio 3.73 Rear Axle Ratio Allison 1000 6-speed automatic transmission Allison 1000 6-Speed Automatic with Manual Shift and chrome recovery hooks. Black Bowtie Emblems - Includes front and rear black bowtie emblems. Limited Promotion Option. California Emissions Requirements Cargo Box LED Lighting - Includes cargo box LED lighting w/ switch in center switch bank. chrome outside heated power-adjustable vertical trailering mirrors
differential case and transfer case (if applicable). Duramax Plus Package - Includes Duramax 6.6L Turbo Diesel V8 engine engine block heater Engine Block Heater exhaust brake G1W oil pan Rear Under-Seat Storage - Includes composite storage bin under the rear seat. Limited Promotion Option. Underbody Shield - Includes frame-mounted front underbody shield starting behind front bumper and running to first cross-member protecting front underbody VXH GVWR of 10000 lbs.