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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