Well my buddy with his 2005 Duramax and the Allison tranny made his first trip this last weekend. We both went 600 miles round trip, his 5er is 15K in weight while mine is 10K. Driving the Parks Highway in Alaska (lots of hills). His tranny ran at 210 to 220 F most of the way while my modified E4OD ran at 150-165F. Are these common temperatures for the Allison? Do you haulers recommend any Mods (like larger tranny pan, extra cooler, synthetic oil, other)??? Those temps just seem high to me. Thanks for any input.
