Hi I am new to this forum and was looking for advise for a tranny upgrade or a transgo jr shift kit. I have a 2004.5 LLY dually that I've owned for around 3 years now with 180000 on it with 4 inch mbrp with front pipe, air intake, afe turbo inlet pipe, bull dog power pup with the performance tune (85 hp tune) egr blocker plate . I have a feeling if I put anymore parts into it I am going to limp the trans. I'm not looking for a ton more hp till I get it paid off. I am averaging around 21 mpg unloaded and 16 mpg with my 6000 pound trailer. Does anybody have similar mods that has tranny upgrade, or are they still running a stock trans? Any insight would be greatly appreciated.