[67msarg3]

From what I have read, your 2004 Alison is already a 6 speed. you just have to buy the conversion valve body along with getting the Transmission control module remapped. i'd say it's a 2500 to 3000 upgrade but the trans itself already has the gears!

 

[67msarg3]

From what i have read, they are the same transmission. However, you would most certainly have to get the TCM reflashed. Just search 5 to 6 speed conversion and you'll find all the info you need. it will be my next upgrade after i sort out the fuel in my oil!

 

[67msarg3]

I'm quite positive that if he was able to rebuild his LB7 trans and then install the upgraded valve body and then have his LB7 TCM reflashed, he would have his 6 speed Allison. just sayin, no expert here...