I run the 518 in my Rampage.. its a 416ci... I dont have lock up.. just
the OD.. it has 4.10 gears in a 9" with fuel injection.. if you start puting
the power to the OD you will start slipping the OD clutch.. my buddy
races his 52 ford PU with a 700r4.. he didnt have any issues until the
conv quit.. he went through 4 conv until he got one to work again but
now he doesnt use OD or lock up on the track.. I know from building
the 518 that the OD clutches are pretty small and cant take a high load..
I pretty much just keep it in OD on the street.. as soon as it shifts into
drive it goes right away into OD.. If you want to run the mile you better
get the Gear Vendor.. I was gonna get one but figures the cost VS
not using the OD on the track... my 416 makes 525 ft of torque