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You can actually convert a 5 speed to a 6 speed simply by changing the valve body and TCM (about $2500) other than that the rotating mass is the same.

The big problem with the LML is the crap CP4 pump, but that can of course be changed. Yes the 2006 up LBZ had the 6 speed. I am keeping my eyes open for a 2006-2011 donor truck at this time. The only major issues with these are the way they dump raw fuel to clean the filter, the later LML and...

The problem with the LBZ is most donor truck have a 5 speed Allison

I believe the Alpha used the 4L80E and the 242 but they had it tuned to under 300HP

I basically reduced the LMM to a LBZ, used a LBZ intake horn, oil fill pipe and the "other" stuff was simply removed.

Looking at the pictures of the LP5 it looks to have a much larger turbo, I had to reduce the height of the LMM to about the same overall height of the AC compressor, you are going to have your work cut out for you. It certainly does not look like anything near the 2" body lift I used is going to...

The 242 will not bolt up to the Allison and not likely that it would live long, besides the shift on the fly TC is really handy, it does mean more work and a third control module.

I cannot see why any one would be rated higher than the other, everything is the same but for the ratio, they used higher ratio diffs on the higher rated trucks because of the piss poor power of the Detroit. (and the piss poor 1st gear ratio of the 4L80) I have used tunes up to 475 HP and have...

I am not familiar with the L5P or the 10 speed. If the 10 speed is longer or bigger (dia) than the 6 speed I would say that would likely be an issue. Other than that you may have to find some earlier components, one thing I had to use on the LMM was a LBZ oil fill tube as the LMM was too high...