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Originally Posted by engineersDURAMAX I was fueling up last week when another dmax pulled up to the next pump. We began swapping stories and he mentioned he worked for a company that sold the medium duty allison transmissions. He then told me that an allison tech guy told him that the origional 5 speed allison 1000's used from 2001-2005 had all of the hardware to make them 6 speeds, it was only a slight electrical mod. Is this true or is he full of crap? 
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The hardware is in the trans. C3 releases and C4 applys for 6th gear. Valvebody is different. You do not have enough detents on your shifter for 6th gear.Computer has changed along with the comunication. NSBU swith is no longer as the new switch is internal and is only a nuetral switch now. NSBU was much more than just a nuetral switch. The whole strategy is different. It can be done for a lot of money and will require help from Allison.( which they won't give )