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Bottom line its a 5 ton truck. Thats not all that much when you consider todays standard. Allison makes more HD models but the one offered in the 900 series seems to work good. I must be honest I have never pulled anything or big weight but I have drove them thousdands of kilometers and never...

I have a M931A1 and a M923A2 both with the allison auto. I would say its a over kill with this trans and what the truck weighs loaded. I did have to adjust my trans some to loose the hard shifts but now they shift pefrect. I also changed the trans fluid to DEX3. The auto trans lets me...