Well they figured out the problem. The keyway to the input shaft broke off clean allowing the shaft to spin freely without pumping any fluid which stopped the gears from engaging. He said the fluid was clean, they drained it and didn't find any metal/debris. I'm surprised how clean the fluid looks in the pics. Car has about 40,000 miles. He said they actually have a pump in the shop with about 100 miles on it from the tranny they used during Mercedes training. Replacing the rear main seal while it's dropped.


Surprised that piece just snapped and nobody else running theirs hard at the drag has had this happen. Guess just one of those things.