Forward to 2018. When I installed the ford diff, i put in a ARB air locker and changed gearing to 4.86 from the original 4.11. Since then I installed a new 318 engine with 4bbl carb and a cam. I goes good now. 1st gear performs like a bull low with the 4.86 gears. I have purchase and yet to install a rebuilt A518 transmission. Similar to the 727, but with a lock up torque and overdrive gear. The overdrive and lockup torque are controlled by 12v power so, I will probably just install a just toggle switch to activate them.