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I have an allison PCM and a partial harness I thought about using. Just unsure as of yet. Mine is only a 5 speed as well. I just don't like the idea of building a truck, using the a1000, and then hating it because I can't tune it without a trip to allison 20 times until it's right. Or, spend $1800 for Scott's controller. Too much money.
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Here is a thread on allison 5 and 6 speeds.
http://www.4btswaps.com/forum/showth...p-guide-thread
I have chatted with howard some over the past year about his system. Sounds like it works great! The down side to it is if a guy wants the tow/haul and tap a shift functions. They arent available with the allison system. The gm system seems to be very complex from what Howard tells me, derating fuel for shifts, locking and unlocking the converter in a variety of situations to help with emissions, shift harshness ect whereas the medium duty allison system is more basic in its function. Will the allison medium duty system work for me? yes it will. Would the tap a shift function be awesome to have? Yes it would. Now you can see my dilemma, which to choose?