The race for the rear bearing is not actually in the cover but there is a spacer looking thing between the cover and the case. This spacer was siliconed onto my case and was a real bugger to get off. I gave up on two occasions and just put the cover back on it was so solid.
Not all input gears are the same. I don't know how to tell them apart. Tooth counts I guess.
Mine is not a cross drilled gear but has a factory oil feeder plate behind the cover. No wear at all to my shaft or gear. This must have been the fix they used before the cross drilled gear. You can get aftermarket oil feeder plates too.

