Quote Originally Posted by Booba5185 View Post
I've always heard it was bad to spin a transmission in neutral at high speeds. When you shut one of the engines off, do you leave the transmission in neutral?

I still see a problem with the 2 engines being out of sync. They're not independent of one another because they are part of the same chassis. No matter what happens, one engine is dragging or pulling the other, because they are physically attached to one another. I don't know fit that is what caused your transmission issue, but time will tell. I would think it'd be odd to the PCM because the transmission is being drug through each shift. When a typical car shifts, acceleration stops during the shift...not here though.
When a car shifts under hard acceleration momentum keeps the acceleration going a second or two. It's nothing unusal. The fact the other engine helps keep more momentum going reducing the shock in the next gear.

The car shifted really incredibly well. I think it was a freak breakage because of the very high miles trans in the car. I think it's the chain that snapped, it was probably tired already. A fresh trans would go a long way.