Very Nice Thread Asheck.

In the stock A Arm setup, is there enough room for the added diameter of cut-down E Revo shafts?

Have you ever had the Slash diffs apart? I was thinking it used the Revo diffs. I took a closer look and it doesn't look like it does.

Same gears inside?

?
Yes, there is plenty of room, on the arm side. The front shocktower does have to have a little shaved off the bottom of the link mounts. This is what weakened my first aluminum shocktower, that broke there, for the second one I ground off the shaft . But in these circumstances, I think a little off the mount would be fine.
I pulled the diffs apart to change the outputs. I had extras from old blown E-revo diffs, and they dropped right in. I too, was expecting to see the same diff as the Revo, and was surprised to see the differences, but it seems they are where it counts.

I wonder if we could raise some other people's interest, if Mike would make a batch of carriers that would fit the Slash, and use Revo bearings. I would imagine 1 set would be costly, but 5 sets might make it reasonable. Especially when the Tekno's are almost 100$ for a set of 4, and they are dogbones, which means they will wear. I could see the interest for these being high.

That's a good question. I doubt there's enough material to remove to accomidate the OD of the bearings inside the Tekno version.

If the diff-to-wheel drive shafts are the weak link, upgrades to that portion of the truck would be a hot seller.

The factory center drive shaft is pretty bullet-proof looking already.