518 46re smoked

I would really pay attention to the overdrive unit internals. The planetaries and Torrington bearings disintegrate really quickly once a failure occurs. The O/D unit always seems to collect much of the junk in the trans and burn up. If you don't have the proper tools and a press, let a professional go over it. The spring pressure in the o/d unit is ridiculous, and will hurt. Just trying to help
Have press. That's the factor I'm weighing.
I've done plenty of 904,727,c4, 3spds mostly....but no 500/518 od versions.