2003 GMC Sierra 2500HD Reviews"Sierra HDs share a restyled front end with their lighter-duty Sierra 1500/2500 siblings, and also add optional satellite radio and rear-seat entertainment system for 2003. This report covers mainstay 3/4-ton 2500HD and 1-ton 3500 pickups, though chassis-cab and chassis cutaway models are also offered. Sierra HD is similar to Chevrolet's Silverado HD.
Both HD Sierra series are available with rear-wheel drive or 4WD that must be disengaged on dry pavement but includes low-range gearing. An electronic-shift transfer case (replacing a manual lever) is optional on SLE and SLT models. Both 2500HD and 3500 come in a choice of regular cab, an extended cab with rear-hinged back half-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. The extended and Crew Cab include a three-person rear bench. The 3500s come only with an eight-foot cargo box; 2500HDs offer a 6.5-foot box as well. All 3500s have dual rear wheels on each side.
All models have standard dual dashboard airbags and antilock 4-wheel disc brakes; some offer GM's OnStar assistance system. Base engine is a 6.0-liter V8. Optional are an 8.1-liter V8 and 6.6-liter Duramax turbodiesel V8. The base engine teams with 5-speed manual transmission or optional 4-speed automatic with Tow/Haul mode. The two larger engines have a 6-speed manual or optional Allison 5-speed automatic with Engine Grade Braking, an electronic feature that makes an automatic downshift when descending steep slopes. Sierra HDs offer a PRO Professional Package that includes a special console/storage bin, electric warmer/cooler for food and beverages, and rubber floor covering. Newly optional on SLE and SLT models for '03 are satellite radio, a rear-seat entertainment system for Crew Cabs, and power-extending camper mirrors. "