Wrote a big book below with comments on the ZF 8HP70 below. Launcher launches hook ups all of the above in the why. Sport mode/track mode and highway economy driving mileage wow on a built motor all true! Oh yeah manual mode hahaha on built engine in light A body. Lots of fun donuts and track the car check and check all day. The car is amazing I would never touch a 3 speed 904 or 727. ZF is plentiful reliable takes big power. Is there work to be done yes see my transmission thread it's still well worth the work as the reward is amazing.