If there is any question on the freeness of the driveline )and I don't think there is) don't worry. With nothing but proper shimming of the driveline and cleaning the bearings out, I have gotten a consistent 13-14 sec of spin. And thats a light spin. I even kept the rubber sealed diff bearings.....I can honestly say that this car lurches forward noticebly faster than my FT TC3 ever did. And I had hours and hours of work on the FT. Awesome job Yoke!!!