The Sierra gets a revised look this year that includes a new front fascia, revised side moldings and optional multifunction, fold-away mirrors. On the inside, GMC has added new seats, a more comprehensive driver information center, a redesigned instrument panel and optional dual-zone climate control and satellite steering wheel controls. On the hardware side, the standard 6.0-liter V8 gets electronic throttle control as well as the ability to run exclusively on compressed natural gas (CNG) or a mix of CNG and gasoline. Other upgrades include an improved Insta-Trac part-time four-wheel-drive system for reduced service costs, a more efficient starter for the 8.1-liter V8 and a revised headlight switch that allows drivers to turn off the daytime running lamps.

Consumer reviews

Read what other owners think about the 2003 GMC Sierra 3500.

Overall Consumer Rating

4.34 reviews

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5(50%)

4(25%)

3(25%)

2(0%)

1(0%)

Most helpful consumer reviews

Shoulda kept my FORD

Bob Sutliff,01/04/2003

Truck looks great! Fuel mileage (non towing) is not bad for a ton dually at 13 mpg. Towing is another story. Six (6) miles per gallon is the average for this 6.0L engine. Tow mileage is terrible and the truck is at its maximum performance on the interstate at 70mph. It absolutely has no power left.

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Features & Specs

MPG

N/A city / N/A hwy

Seats 6

4-speed automatic

Gas

300 hp @ 4400 rpm

MPG

N/A city / N/A hwy

Seats 6

4-speed automatic

Gas

300 hp @ 4400 rpm

MPG

N/A city / N/A hwy

Seats 6

4-speed automatic

Gas

300 hp @ 4400 rpm

MPG

N/A city / N/A hwy

Seats 6

4-speed automatic

Gas

300 hp @ 4400 rpm

See all Used 2003 GMC Sierra 3500 Extended Cab features & specs

More about the 2003 GMC Sierra 3500

Used 2003 GMC Sierra 3500 Extended Cab Overview

The Used 2003 GMC Sierra 3500 Extended Cab is offered in the following styles: 4dr Extended Cab 4WD LB DRW (6.0L 8cyl 4A), 4dr Extended Cab Rwd LB DRW (6.0L 8cyl 4A), 4dr Extended Cab SLE Rwd LB DRW (6.0L 8cyl 4A), and 4dr Extended Cab SLE 4WD LB DRW (6.0L 8cyl 4A).

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Which used 2003 GMC Sierra 3500 Extended Cabs are available in my area?

Used 2003 GMC Sierra 3500 Extended Cab Listings and Inventory

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Should I lease or buy a 2003 GMC Sierra 3500?

Is it better to lease or buy a car? Ask most people and they'll probably tell you that car buying is the way to go. And from a financial perspective, it's true, provided you're willing to make higher monthly payments, pay off the loan in full and keep the car for a few years. Leasing, on the other hand, can be a less expensive option on a month-to-month basis. It's also good if you're someone who likes to drive a new car every three years or so.

Used 2003 GMC Sierra 3500 Extended Cab

Used