

Blockade ARB - RD173 - Ford F350 Pickup, F450/550 Pickup, E/F350 Dually
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ARB Differential Lock RD173 fits models:
• Rear Dana 70HD axle - Ford F350 Pickup, E350 Van (2WD) - models produced between 1975-85 - with gear ratios of 4.10 and lower - with a ring gear diameter of 266.70 mm (10.5")
• Rear Dana 70U axle - Ford F350 Pickup, E350 Van (2WD) - models produced between 1975-85 - with gear ratios of 4.10 and lower
• Rear Dana 80 axle - Ford F450/550 Pickup, Super Duty Van (2WD), E/F350 Dually - models produced after 1988 - for all gear ratios - when installing the lock, flange holes need to be enlarged to fit 14.2 mm (9/16") bolts
Axle shaft diameter: 38.18 mm (1.5")
Number of spline teeth: 35
For more information about RD173 lock parts, refer to the assembly drawings on the last pages of the lock manual - download manual.