Powertrain and Identification Information.

• VIN 10th Digit designating year = "6"
• Engine: 6.6L Duramax Turbo Diesel 300 H.P. 520 lb. ft. VIN 4th digit ="P"
• Allison Electronic 5 speed Automatic Transmission. VIN 5th digit ="H"
• 448 '06 Models produced "Wave 1" ( 1/05- 5/05). + 281 produced in "Wave 2" (starting 9/05, 1st 2006-2 Model VIN 6E226861). Total 729 '06 models produced including 9 Border Patrol.
• Final Decision to end civilian H1 Production made Tuesday May 9th 2006, officially announced to public Friday May 12th 2006.

• 6.6L Duramax Turbo Diesel Engine.
  • Increased fuel economy.
  • Quieter.
  • More Horsepower.
  • More Torque.
• Expanded towing capacity– GCWR 17,300 (13% Increase).
• Allison 5 speed transmission.
  • Durable, Heavy-Duty Design. Used in general purpose trucks, one-way rentals, refuse vehicles, school & transit buses.
  • Tow/Haul Mode Button
  • First Gear Ratio 3.10:1 vs. 2.48:1 (4L80E)
  • Improved Drivetrain Braking.
  • Final Crawl Ratio of 41.5:1 - 22% Better.
  • Overdrive Gear Ratio 0.71:1 vs. 0.75:1.
• New Heavy Duty Steering Gear.
• Factory Warranty improved to 48 months or 50,000 miles.
• New Frame Rails and Cross members.
• New Shifter.
• New Air Intake.
• Revised Brushguard.
• New Wheel Color.
• Intercooler.
• New cooling fan.
• 2" Body Lift.
• Larger brakes.
• New Helical geared hubs for quieter operation and reduced rocking at stops.
• Increased fuel tank capacity.
• Stronger halfshafts. 17% increase in torsional strength.
• New Color Mystic Green.
• New Color Flame Red Pearl (replaces Firehouse Red).
• Discontinued Colors: Firehouse Red, Summit Silver

• Helical-cut Gear Sets to reduce “growl” during deceleration.
• Minimize suspension “rock” at stop.