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Can you also explain what goes into making a th400 a th475 to withstand the output of a 6bt? Thanks!!

Where did you get your 4bt. have seen a few for sale but they are either low hp (like100) or they are way expensive (4k+). I have plent of room for an aftercooler especially if I use the 4bt instead of the 6bt.

hey beaubeau, does your son have a phone number i could reach him at to discuss his conversion? You mention Frito Lay trucks have the 4bt - can you recommend a place whre i may purchase a good used one. I know Ralphs truck world in Portsmouth NH has used engines but they do not have any 4bts...

I am not really concerned with 'top' speed as I am running 36 inch tires and will use the stock 400 trans. more concerned about making sure it has enough hp to turn my tires and pull my horse trailer. that is why i am leaning toward the 6bt instead of the 4bt.

I have a 1984 m1008a1 with 14k original miles on in and want to put a cummin 6bt or a 4bta in it. Does anyone have a place to recommend where I could purchase a 6bt for my conversion? any help would be greatly appreciated. Thanks!!