Jason Gonderman
Contributor
Until recently the only locking differential option for the Ford 93/4-inch axle was to buy an '09-or-later Ford F-150 pickup with the factory electronic locking diff. With nearly six million 93/4 axles on the street (commonly found in the F-150 and Expedition), it's a wonder that nobody has offered a selectable locking differential until now. ARB, the world leader in air locking differentials, saw the potential of the 93/4 axle and introduced the RD150 Air Locker for the Ford 93/4 34-spline axle.
After you remove the differential cover and drain the gear oil, check the gear pattern to determine the current gear mesh. With the axleshafts out, remove the factory carrier.
As we write this, the ARB RD150 93/4 Air Locker is only available for use with the factory gear ratio, but by the time you read this it should be available for all aftermarket gearsets and ratios. Since our '08 Ford F-150 was in need of a better traction, we went to 4Wheel Parts in Redondo Beach, California, for the install.
Applications
The Ford 93/4 ARB is available for these '97-current Ford vehicles.
•F-150
•Expedition
•E-50, E-250, E-350 vans
•Lincoln Navigator
Tools Of The Trade
Installing an ARB Air Locker (or any locker, for that matter) into an axlehousing can be daunting for professionals and amateurs alike. In addition the tools to perform this work are either difficult to get or just plain expensive. For this reason ARB has introduced a line of air locker service tools, including an easy-to-use differential spreader (shown), a clamshell-style bearing puller kit, an air locker test gauge, a contoured shim driver tool set, and adjuster nut pliers for setting preload on adjuster-nut-type differentials. If you do any kind of differential work these tools from ARB are must-haves.
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