Chevrolet Silverado: What Does Z71 Mean?
When the pavement ends, Chevy's Z71 off-road package gives truck owners the confidence to tackle any terrain. If you're looking for a pickup that won't quit when the going gets tough, look for a Chevy Silverado with the Z71 badge. This brief guide delves into some of the more unique and interesting features found on Silverado Z71 models.
This article applies to the Chevrolet Silverado GMT800, GMT900, and K2XX (1999-2006)
There's an old proverb that goes, "A well-beaten path does not always make the right road." Fortunately, there's a pickup truck that can help you take the right road even when there's no road at all: The Chevy Silverado. When equipped with the optional Z71 package (available exclusively on the LT and LTZ trims), the Silverado is transformed into a fully-capable off-road machine. And just so everyone knows what your truck is really capable of, each Silverado equipped with this optional off-road package features exclusive Z71 badges and graphics. Whether you're thinking about purchasing a new or used Silverado Z71 or just want to learn more about Chevy's revered off-road package, check out this brief guide for more information on some of the features included with a Z71 upgrade. Note that the exact features vary for each production year, so refer to the RPO code listing in the truck or speak with your local Chevy dealer for specific package information.
Included in Z71 Off-Road Package
Rancho Shocks
What started in the 1950's in Long Beach, CA as Rancho Jeep Supply quickly grew into one of the most trusted performance suspension components manufacturers in the world, especially among the off-roading crowd. Current model Silverado LT and LTZ pickups equipped with the Z71 package include heavy-duty Rancho shocks to help you stay comfortable and in control when the road gets rough. These monotube shocks feature a high-pressure gas charge that separates the unit's internal oil and nitrogen. The result becomes an additional spring rate along with exceptional ride control characteristics when the pavement ends and adventure begins.
Hill Descent Control (HDC)
For 2014 models and newer, every Silverado equipped with the Z71 off-road package includes Chevy's new Hill Descent Control feature. HDC is designed to give drivers a smooth, controlled descent down steep grades. When engaged, HDC uses the truck's anti-lock braking system to control each wheel's speed so the driver can concentrate entirely on steering. HDC makes the difficult task of navigating down steep, rough terrain easier by maintaining a safe descending speed. It should be noted that HDC can be disengaged for those times you prefer total driving command.
Automatic Locking Rear Differential
Standard on newer Z71 models is an exclusive automatic locking rear differential. Manufactured by Eaton, this heavy-duty automatic locking rear diff (also known as the Eaton G80) reacts in milliseconds to distribute power among the rear wheels for improved forward motion in low-traction situations. Whether you're crawling up a muddy hill, driving over sand, or navigating through the snow, the G80 transfers power to the wheel with the most traction to keep you moving forward. As an added bonus, this differential acts as a conventional light-bias limited-slip differential during normal driving conditions.
Additional Features
Silverado Z71 off-road models come with additional features to help you conquer the road-less-traveled. The specific package changes with each model year, but some of the other features you can expect on a Silverado Z71 include:
- Underbody transfer case shield
- Thick gauge anti-sway bar
- Heavy-duty torsion bars
- High capacity air cleaner
- Brushed metal sill plates
- 18" or 20" custom wheels
- All-terrain tires
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