Just got my Trans Go manual shift kit for my 4L80 and I'm a little worried about my tranny guy doing this right. It has dones of parts and a video tape for instructions. Seams like too many things to go wrong and even though my tranny guy has had years of experiance, this is the first 4L80 MBV. I'm also curious how this thing shifts. Firm? Soft? Neck snapping firm? Problems??? Still cheaper than doing the stand alone computer. Also, what other internal parts should I be looking at to beef it up? Clutches? Sprag? Etc? 400sbc goes in next week. New AFR heads coming.