Thanks guys, I 'll switch it over to Sta-Lube GL4. I found this article while searching the internet.
ATF in a muncie? - THE H.A.M.B.
I had a 1985 S-10 with a 5-speed manual, it used ATF in the tranny. But on my ole Muncie that thicker GL4 will help to keep my truck from "marking it's territory. Well the thicker lube will help, but the new lipseals and shift arm seals will no doubt help more.