Fix what you have. 340 and 504 have the same size transmission case that can be used with center housing internal hydrualics. But there's so many different gear ratios used along with differentials, bull pinion gears, bull gears and axles that things get complicated. There is a lot of parts that can be switched between rears, but takes study of parts to do it. If the 460 doesn't have a CC suffix on the serial # plate the 300 and 350 farmall will have 3rd gears you can use to replace the 460 with. If it does have the CC I can't remember what other gears are the same without looking it up. If repacing the 3rd gear on the counter shaft along with the 2nd and third slider gear you can install the gears even if its the different third gear ratio. May not want to change your ground speed though. 460 third with the CC suffix is a slower ground speed than ones without CC.
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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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