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I have the 2003 Dodge with a Smarty Jr and an mp-8 box for the SO 250hp 480ftlbs of torque Cummins. I have a 47re in the truck with 76000 plus miles on it to date. I have a good friend who is a tranny specialist and says there are very small differences in the 47 and the 48re. If you do like the one gentleman suggested and service the transmission and take care of it I believe you will get good service out of the truck. I also use a synthetic transmission fluid by Amsoil which I believe contributes to extending the life of the tranny. I'm sure thats not what some of the others would believe but thats okay. I to believe that how you drive it when loaded has a lot to do with life. I pull a 3485sa with mine. Al
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