Steel 6 Degree Shims

These steel 6 degree tapered shims are 2 1/4" wide and machined specially for WILD HORSES to fit the unique Bronco size springs. These are not cast, and will hold up under extreme conditions. They include both 3/8" and 7/16" center bolts. WILD HORSES rear springs use the larger 7/16" bolts. Most stock and aftermarket rear springs will use 3/8" center bolts.

Tapered shims are used to help correct rear pinion angle, especially after changes are made to the rear springs or rear axle housings. Often when installing a rear suspension lift, the rear pinion angle will move downward. This may be just visible or you may feel a vibration in the driveshaft, especially under deceleration. We've found 6° to be the perfect correction for most modified Broncos. With the double-cardan style rear driveshaft found on all 66 to 77 Broncos, the proper angle is about 1 or 2 degrees below the driveshaft centerline. This angle can only be checked with the full working weight of the vehicle on the suspension. It can't be checked while still in the air, or with only partial weight of a vehicle still in the process of restoration. Bolt these shims on the spring pack above the perches of the rear housing with the thin edge pointing forward.

Note: don't use information for other vehicles that state a zero angle is required for double-cardan shafts. Broncos with leaf spring suspensions work best with this 1 to 2 degree minimal downward offset.