This may or may not help but if I can pass on some intel---may save you some jackup time or jackoff time!!! :grin: :spank: Anyway the TCI kit from Summit in my TH400 got me EXACTLY 5000 RPM shifts with weights 3+4 and using the Original Equipment springs on my govenor(72GS455).Also by jacking up the rear on the passenger side just infront of the rear tire caused little fluid loss.Oh yeh as has been stated before---be sure your KICKDOWN/downshift is working properly or you will just be "urinating in the wind" :laugh: BUY the book by Ron Sessions about the TH400. I wonder if Ron Sessions is a pen name for "Larry" HTH Pete
