Spindle Bushing - Upper Fits Allis Chalmers 7040 7060 7045 7050 7080 7010 7020 2One New Aftermarket Replacement Spindle Bushing Upper Fits Allis Chalmers Tractors This upper spindle bushing is a front axle steering component that supports the spindle kingpin at the top of the axle housing on Fits Allis Chalmers tractors. On D21, 210, and 220 models, this bushing serves as both the upper and lower spindle bushing (2 per spindle, 4 per tractor). On 7000 and 8000 series models, it is the upper spindle bushing only (1 per spindle, 2