A998/999 Lock-up behind 5.9 magnum?

[Squishy]

I have an A998 lockup trans that I want to put behind a 5.9 Magnum. Having some issues with a converter that will work. Have any of you gone this route before, and what did you do for a lockup converter?

 

[Professor Fate]

I used the factory lockup convertor, mounted to the 5.9 Magnum's weighted flexplate.
Oval out one hole in the flexplate and the convertor bolts right on.
Just make sure your convertor is internally balanced (318 or V6), or if it's from a 360 (not sure if any were equipped that way, definitely not common) remove the external balance weight.