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The Dana 44 rear axle first saw use in the 1940s and is still in use today. The Dana 44 has a GAWR up to 3,500 lb (1,600 kg) and is a semi-floating type, having one bearing on the end of the axle shaft which carries the weight of the vehicle on the axle and also allows axle rotation.
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.
Wheel bearing rolling resistance is lowest with high axle loads and intermediate speeds of 60–80 km/h with a Crr of 0.00013 (axle load of 21 tonnes). For empty freight cars with axle loads of 5.5 tonnes, Crr goes up to 0.00020 at 60 km/h but at a low speed of 20 km/h it increases to 0.00024 and at a high speed (for freight trains) of 120 km/h ...
The Dana 80 Trac Lok is unique being it is a 4 pinion unit, unlike other Dana Trac Lok units with 2 pinions. This was the only rear axle available for the 2nd generation Dodge Ram 3500 trucks. [2] 35 Spline Dana 80 in a 2002 Dodge 2500HD Diesel
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.