Attachment 614515 doesn't open but in the .pdf below, parts 30 and 40 are select-thickness shims used to set up gear clearance. Often new bearings are consistent enough to use the existing shims when reinstalling the original gears. If approx .005 to .015" backlash can be felt the setup is ok.
Thanks for the info above. I still need to remove the existing collar because it is visibly scored. The "barrel" the pinion gear, collars, and bearings is open to view into and see the ring gear. What I believe is the existing scored #030 collar is in the barrel at the bottom, above the ring gear. All of components came out except the #030 collar closest to the spiral bear of the pinion shaft. Could you explain how to measure the backlash? Is this the amount of "play between the collar inside and pinion gear outside, measured by a feeler gauge?