Heretofore present design truck axles have been assembled with at least one .060″ shim placed between the pinion bearing and axle housing. This shim was used in regulating the pinion adjustment.
In present truck axle production these shims are no longer used. The assembly at this point being the same as used in Model “A” rear axles.
To compensate for the removal of the shims, the length of the pinion neck on the right hand rear axle housing has been increased -h”, The symbol number of the new housing AA-4010-F remains the same as the old design housing.
When replacing an old housing bell with the new design, omit the .060″ shim and make the pinion adjustment with .005″shims as required.
The old design housing can be readily distinguished from the new design by measuring the pinion neck at the point shown in Figs. 1152 and 1153. See page 413 in the January, 1930, Bulletin for pinion adjustment.