Silverado Classic HD is the heavy-duty version of the Silverado Classic 1500. The name Classic denotes a basic design that dates from 1999 and is making its final appearance for 2007. GMC, Chevrolet's sister division, sells near-identical Sierra Classics. All these trucks are sold alongside redesigned versions also designated as '07 models.

Essentially unchanged from 2006, Silverado Classic HDs come in 3/4-ton 2500 and 1-ton 3500 series. Trim levels are WT (Work Truck), LT, and top-line LS. Three cab types are available: 2-dr regular cab, a 4-dr extended cab with rear access doors, and a crew cab with four full-size front-hinged doors. All can be ordered with front bucket seats or a 40/20/40 split bench. Extendeds and crews include a three-person rear bench. Regulars come with an 8-foot "long" cargo box. Extendeds and crews also offer a 6.5-foot "short" bed. Dual rear wheels are available, as are chassis-cab and chassis-cutaway models.

All Classic HD pickups are available with rear-wheel drive or 4WD that includes low range gearing but cannot be used on dry pavement. An electronic-shift transfer case is standard on 4WD LTs, optional on LSs. All models have standard dual dashboard airbags and antilock 4-wheel disc brakes. Side-curtain airbags are not offered. The base engine is a 6.0-liter gasoline V8 with 300 hp. A 330-hp 8.1-liter gas V8 is optional. Also available is a 6.6-liter "Duramax" turbodiesel V8 that returns from a 2006 update with 360 hp, up 60. The base V8 teams with 5-speed manual transmission or optional 4-speed automatic with Tow/Haul mode. The two larger engines offer a 6-speed manual or an optional Allison 5-speed automatic with Engine Grade Braking, an electronic feature that makes an automatic downshift when descending steep slopes. Options include satellite radio, OnStar assistance system, a rear-seat entertainment system for Crew Cabs, and power-extending camper mirrors.