“VortecMax” trucks utilize the same high-output 6.0L LQ9 V8 found in the Silverado SS and Escalade. Previously referred to as Vortec “High Output”, the name switched to “Vortec Max” in 2005
The VortecMAX performance package (combined with Heavy Duty towing package) is designed to increase the towing capacity to 10,000 lbs on the extended cab (9,900 lbs on the crew cab). This was achieved with the use of a new-for-2006 “super duty” transmission known as the 4L70E, a heavy-duty trailering package, new 9.5″ rear axle (4:10 gears), and an automatic locking differential
The performance-driven LQ9 engine features powdered metal rods and hypereutectic aluminum flat top pistons that provide a 10:1 compression ratio. Hypereutectic pistons feature high silicone content – this adds thermal stability to the alloy, keeping the piston stable through a wide range of temperatures
The LQ9’s real party piece is the heavy-duty cast-iron block. At 216 lbs, it’s 100 lbs heavier than the aluminum LS1 block. The racing industry has consistently proven that the blocks alone can withstand over 1000 horsepower (stock internals can handle around 600hp)
The extra power called for a stronger transmission, but GM did not want to use the larger (and heavier) 4L80E transmission. This is where the newly developed 4L70E comes into play: the 4L70E provided the increased torque capacity needed over the 4L65E without any increase in size (thanks to expensive materials). The 4L70E could also shift at higher engine speeds. This transmission debuted solely on 2006 HD trucks optioned with the VortecMAX performance package (shown here)
Key Model Year Changes:
Final year of the 1st generation Sierra
First and only year of the 4L70-E for this bodystyle. This transmission was only available on VortecMax trucks with the towing package (now with increased tow ratings)
First and only year of the VortecMAX Performance Package for this body style
New power-adjustable camper mirror glass with increased field of vision and convex spotter mirror
OnStar and XM Satellite Radio antennas are now combined into one
56k original miles
Vortec Max engine (high output 6.0L)
Serviced when needed
Tow Package w/ electronic brake control
Full leather interior
Accessories: 20″ tires/wheels, cat-back exhaust system, cold air intake system, Leer Topper, Line-x spray on bed liner
CONTACT SELLER – Update: Seller’s Autotrader ad has been deleted (sold or removed from market)
*SAE rated from factory. May not reflect current output.
*Performance numbers pulled from either the factory brochure or reputable automotive road tests.
*Base price when new does not reflect original MSRP of this particular car, nor does it reflect what the original owner paid for it.
*Advertised price at time of posting. Sellers can raise or lower prices on their original ad at any time. Click on the original ad to view current price/availability.
Mileage Disclaimer: NOC has not confirmed if the mileage stated by the seller is true and accurate. It is up to the buyer to verify these claims. Vehicle history reports, service records stating mileage, and even inspections of odometer tampering are recommended.