I built a tranny for a friend who raced a 1970 340 Duster, it was a stock tranny to start with and I swapped the stock 2.65 gears and cluster to a set of stock 3.09 gears and cluster from a 1965 NP833 A body 4 speed, he had installed a Dana 60 with 5.57 gears in it with ladder bars and a slider set up on the stock leaf springs. I drove that car more than once at the track, you where really busy the first 300 feet
![boogie boogie](/ubbthreads/images/graemlins/custom/boogie.gif)
Let the clutch out at 7000 RPM and try and shift at 7000 RPM and wait for the 1/4 mile finish line to come up
![grin grin](/ubbthreads/images/graemlins/custom/grin.gif)
He never broke that tranny or rear end
![shruggy shruggy](/ubbthreads/images/graemlins/custom/shruggy.gif)