you would go to a TH400 instead of building the stock auto with a high stall converter (if you convert to an auto)? The TH400 eats alot of power in addition to the parasitic loss thru a high stall non-lock up converter. I have one (a TH400) in an older Z, and while it's pretty much bullet proof, it really robs alot of power that belongs at the rear wheels. What ever you decide to do, good luck and again nice pass! Take care, mark