The reverse idler gear slides when shifting into reverse. As I recall, that engages it with the gear on the lower (output) shaft and it is always meshed with the upper gear. The only other gear that is meshed in neutral is the oil slinger gear, which is the rearmost gear on the lower shaft. In neutral, the lower shaft does not move and the oil slinger is running on a bushing.
Since the oil slinger is die cast, it is soft and easily picks up chips that can cause a tick. Any noise in neutral is likely to be from the oil slinger. Other posibilities are the reverse idler or a bearing on the top shaft. They are all that is moving in neutral.
Don't know what the loud crack was. May have been the oil slinger destroying itself. Could have been caused by ice.
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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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