Rear Alignment Pinion Shims by Specialty Products®. Quantity: 2 per Pack. This wedge -type shim fits between the rear spring and the axle to change pinion angle by ±2. 5°. It fits the unique 2 hole design of the new F150 platform. Recommended to align the driveline on vehicles that have been lowered or lifted. The performance alignment components is right what the doctor ordered to balance traction and wear after modifying your vehicle’s suspension. It will provide the adjustment range needed to correct camber, caster, and toe alignment angles to ensure you get the best performance out of your tires and prevent their uneven wear. By adjusting angles according to your specs, this part will help you enjoy better traction, more crisp, predictable handling, and enhanced stability.
They will work if you are not concerned with endurance or safety. The slot is milled into the thicker side, probably for easier installation. I would think it would have been better if it was milled in the thinner side. When clamped between the leaf spring and the axle perch, and the bolts torgued to 98 ft/lbs, they will crack. I bought some others milled from steel.