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Gross Axle Weight Rating (GAWR) 6500 lbs (full float, rear axle) 5500 lbs (semi float) GAWR is vehicle axle weight plus rated payload capacity; Ring gear diameter: 9 3 ⁄ 4 " Axle shaft diameter 1.41” Front (32 spline) 1.46” Rear (32 spline) 1.50” Front (35 spline) 1.50” Rear (35 spline) Inner axle shaft splines: 16, 23, 30, 32, 33 or 35
The axle tubes were increased to 4 inches (100 mm) diameter and carrier bearings were larger and thicker, the axle shafts were 35 spline only. These upgrades gave the Dana 70HD a gross axle rating of 10,000 lb (4,500 kg). The Dana 70 front drive axles used in the Chevrolet Kodiaks and GMC Topkicks also had these features.
However, the 10.5" 14-bolt axle remains in production today, specifically utilized in GMC Savana and Chevrolet Express vans. Notably, the 11.5" 14-bolt axle is featured in third-generation Dodge Ram 2500 and 3500 trucks. There are discernible differences between the GM and Ram versions, evident in the gaskets used and the axle cover designs.
The axle load of a wheeled vehicle is the total weight bearing on the roadway for all wheels connected to a given axle.Axle load is an important design consideration in the engineering of roadways and railways, as both are designed to tolerate a maximum weight-per-axle (axle load); exceeding the maximum rated axle load will cause damage to the roadway or railway tracks.
An all-wheel drive option was offered for the model years 2003–2014 on 1500 and light-duty 2500 vans (below 8,500 lbs GVWR). AWD vans came exclusively with a 135" wheelbase and GM's 5.3L V8. For 2022, the Express entered its 26th year of production, overtaking the 1971–1996 Chevrolet Van in production longevity.
Factory center sections carry two (2) different bearing dimensions (3.0625 and 3.250 in or 77.7875 and 82.5500 mm). Factory axle shaft and differential spline count is 28 and 31, although aftermarket axles with 35 and 40 spline count are readily available from reputable manufacturers. Wide variety of axle bearing flanges were fabricated.