2024 Duramax Towing Capacity Chart. As we can see from these tables, the 2024 gmc sierra hd model with the highest towing capacity rating is the 3500 hd regular cab / long bed drw (dual rear wheel) with. Rear axle ratios are used so that a truck can be closely tailored to match load hauling and performance demands.

Starts at $46,395 towing capacity: Numerically higher ratios (such as 4.10) increase engine rpm relative to the road speed, resulting in greater load.