The SPC 0° sleeve is made for Ford F450 and F550 Super Duty trucks with Dana Super 60 solid axles to help determine alignment needs. Use the 23239 zero-degree sleeve to find the needed change and then install the correct degree sleeve. To split camber and caster adjustment, rotate the sleeve 45°. These sleeves correct alignment problems on F450/F550 trucks with Dana Super 60 axles.
SPC Performance 0 deg. FORD SLEEVE