Someone stop me if I am wrong, but I think there is only 3 bronze bushings in the entire rear end. 2 on the reverse idler gear and one in the end of the lower trans shaft for the PTO. There are two bushings for the brake band pivots, but they are sealed off from the rear end. I would have to say the High GL rating is most likely shear additives for high load applications and I think they use sulpher for that. If you let water get in the rear end from sitting outside or washing the tractor a lot, it could cause sulphuric acid to form and eat the bronze. My H manual does say to change the gear oil once a year. When they were new, some gear oils acually had lead in them for high friction protection. Lead is one of the best friction additives there is, but the gov had their way with that way before the EPA existed. I do know where about 20, 1 gallon square metal cans of that old stuff with the lead is sitting, but you have to buy the ring and pinion/differential assemblys to get them and they fit early-mid 50s buicks.
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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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