You'll know once you pull the tranny out, grab your manshaft, and shake it.

Actually our transmissions are more alike than you'd think. Hardened steel helical cut gears and soft aluminum cases. When you apply 400lbs of torque to a helical cut gear, a lot of lateral forces are applied. Far beyond their design anyway. I don't doubt that it could happen, but if the endplay were bad enough to do that, the case should be leaking inside the bell housing. I didn't see that when you had it apart.

The fact that 1, 2, and 5 looked far less damaged than 3 & 4, and the lower mains being squashed in the center seem to indicate [to me] that the bearings were just too soft for 20 PSI. I would have expected to see distortion all over the bearing, and for the outer bearings near the rear main seal to be the worst if it were being affected by the transmission somehow. We should have numbered them all when we pulled them.

I know the set you have coming would have taken the abuse, and they're going to kick ass with the new crank and tranny. I like the way you just have a spare LSD lyin around. That's pretty convenient.