I had already removed the pinch weld when I redid the fire wall so that was fine but the Reid case had one high spot that required a 2 inch long by about 1/2 inch deep dent on passenger side of tunnel close to the top. If you look at the pic of the trans its the boss just to the left of the "REID" letters that 's what hit. That may not exist on a stock 400 case I really don't know.