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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 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
For model year 2000 - 2004 trucks, the F-150 7700 offered this axle and the F-250 light duty was discontinued. At least till 2011 the 12 bolt semi float was still found with the heavy duty f-150. Gear ratios were 3.73 in 4x4 and either the 3.73 or 4.10 in the two-wheel-drive models. This was available in both limited slip and standard variations.
The Dana 70 rear axle was first used in the Dodge W300 in 1958. The Dana 70 started out using 10 spline pinions and 23 spline axle shafts. The later, more current, Dana 70 axles use 29 spline pinions and 32 or 35 spline axle shafts. Dana offered two different limited slip differentials with the Dana 70, the "Powr-Lok" and the "Trac-Lok."
The "highboy" 4x4 were fitted with 3-inch width 5-leaf (or 6-leaf) front springs; the rear suspension was 2 + 1 ⁄ 4-inch width 9-leaf springs (in contrast to the 3-inch width springs on other F-series trucks); to raise the rear ride height, the rear axle used a 4-inch lift. [18]
For the rear axle the F-350 trucks used a Dana 60 for the single rear wheel trucks and a Dana 70 for the dual rear wheel trucks until 1985 when Ford once again phased in their own Sterling axle. Factory lifts used 2" blocks on the rear suspension, or 2" front and 4" rear on HD trucks, usually on F250s and higher trims.
A roller bearing between the axle hub and axle shaft ensures easy rotation of the non-drive wheels. On the axle side, it is mounted to the holding bracket from the chassis; on the disc side, the wheel is mounted to the bolts of the WHA. When replacing, a wheel hub assembly should be torqued to the vehicle's specifications to prevent failure. [1]