I am fabricating a straight axle for my rod that I am building and I have pre 1937 ford spindles. My axle bosses are 2 1/4". I am aware of the fact that 1937-48 spindles are used in this application for different reasons. What I have been noticing is that there is a thrust bearing between the axle boss and the spindle boss. With the spindles that I have there is only enough clearance between the two bosses for a shim. The spindles that I got came with king pins and thrust bearings. Did the thrust bearing go on top of the spindle in the early model A front end, or was the axle boss for these early spindles less than 2 1/4''. Any insight would be great.

thanks

nick