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The GM AAM axle tubes exhibit a smaller diameter at the spindle compared to the AAM Dodge axles—measuring 4" for GM and 3.5" for Dodge from the housing. In design variation, newer GM trucks are aligned with Dodge axles. Additionally, GM incorporates a vibration damper on the yoke, while Dodge positions it on the drive shaft.
The Dana Super 70 rear differential has become a staple axle for GM and Ford in the dual rear wheel chassis cab vans since 1999. The ring gear is larger at 10.75 inches and features 37 spline axle shafts. Only 2 OEM gear ratios are offered: 4.10 gears and 4.56 gears. [1]
1.50” Rear (35 spline) Inner axle shaft splines: 16, 23, 30, 32, 33 or 35 Aftermarket inner axle shaft splines: 40 for after market, high performance axles, equivalent to Dana 70 components; Pinion shaft diameter: 1.625" Pinion shaft splines: 10 or 29; Gear ratios: 3.54:1 - 7.17:1
The GM 9.25 IFS has been the main front differential in Four-wheel drive 3/4 Ton and 1 Ton GM trucks since 1988. The Dana 60 solid axle front end was used selectively in trucks with a higher GVWR from 1988 to 1991. The original Saginaw 9.5 differential, ring and pinion were modified to work with the independent front suspension.
It can be identified by its straight axle tubes, 10 bolt asymmetrical cover, and a "80" cast into the housing. Dana 80's are made as full floating, rear axles only and are a step up in overall strength compared to the Dana 70. 1988 Ford was the first company to use the Dana 80.
The transmission is often designed separately from the final drive components, including the rear axle differential. In rare cases (such as the 1961-63 Pontiac Tempest, as well as rear-engined cars such as the original Volkswagen Beetle and the Chevrolet Corvair) the transmission and rear axle are combined into a single unit called a transaxle.
For 2007, a heavier-duty 9000-lb spring and brake option package was introduced for Dana 70HD front axle. The rear axle was available in four capacities: 11,000lb, 13,500lb, 15,000lb, and 19,000lb (the latter two were options on two-wheel-drive configurations).
It also lifted the Blazer about three inches higher, allowing it to clear 31×10.5" tires on 15-inch wheels. Enhanced front (7.25" ring gear) and rear (8.5" ring gear) axles with a 3.73:1 rear-axle ratio, larger wheels and axle bearings, a stronger front anti-sway bar, skid plates, and Bilstein shocks were also added.
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