I don't know about a farmall but the allis chalmers I have goes like this...that is if I understand your question...The main transmission pinion shaft can only move forward or rearward, my tractor has a measurement stamped on the housing that tells what the pinion mounting dimension is (center of differential to pinion mounting) if new bearings, pinion shaft and ring gear set is used you have take the bearing measurement, the pinion mounting dimension and the housing dimension and calculate what size snap ring is the right size according to a chart provided in the sevice manual. That sets the main transmission pinion shaft in the correct to or fro position. THEN with a few too many shims you install the differential with the same carriers as was in there, torque the carrier opposite the ring gear to spec's, then install ring gear side carrier and slowly torque to spec's to end up with a bearing preload that is spec'ed, by adding or taking out shims, so it takes whatever amount of pounds that is spec'ed to spin the differential, that tells you what the preload is. THEN take the differential out put pinion shaft in then put differential in with the same shims, starting on the opposite side of ring gear, torque to spec, then go to ring gear side slowly torque until you get spec'ed backlash at pinion and ring, if to much or little move shims from one side to the other to get correct backlash. you should end up with the correct pinion position, bearing preload, and backlash. BUT like I said this is for a allis chalmers. Maybe this will help. Just read your book and think it though.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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