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Can you put a LLY in a 2001 truck? If the LB7 blows up and you need a new one can you just put a LLY into the truck?
 

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The short answer is no. It would require a PCM and wire harness change...and oh yeah, a new Allison to match that new harness.
 

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The short answer would by yes. Fit is not an issue, that part would be easy. However several other things would need to be changed. Wiring harnesses, computer modules, I doubt the Allison would need to be changed out. Most likely just updated. With it being an 01, I'd guess that you'd have to change quite a bit more than you would an 03 or 04. You'd have to update the truck first. I don't think this would be very hard, just expensive and time consuming. It's the equivalent of upgrading the LT1 to an LS1 in a camaro. Again, very possible, but for how much...
I'd just go for a truck with one already in it. When your truck has seen enough miles to kill the LB7, there will hopefully be used LLYs out there. Then buying a used one with an LLY in it would be much simpler and less expensive.

Ox
 
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