My 1992 Dodge W250 with the 5.9 intercooled Cummins 5.9 and Getrag five-speed has 340,000 miles on it and the trans has never been touched. No premature fork wear problems that you've mentioned. It also never had synthetic oil in it until last year. So, it went 300,000 hard miles with petro oil in the trans and did just fine. I have synthetic oil now. (real synthetic) I did that to get the higher heat rating (flash point) that is not available with conventional multi-visc oil.
The popular rumour is . . that the Getrag needs to run 1 quart overfull for best reliability. I've run mine that way for the past couple of years but can't say if it really helps anything. Certainly hasn't hurt.
I DO like Amsoil - mainly because of their history with the USA military. Amsoil started out selling military grade synthetic oil to civilians. Amsoil also offers certain versions with a high ZDDP level that I look for.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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