What budget torque converter?

there is no way to check a converter with out cutting it open. I have been in the transmission business since 1979. yes I have seen guys stick snap ring pliers and check the sprag in stator but there is no way you can put the same amount of torque that is produced by an engine. if you attempt to flush a converter there is no way of knowing you got the torrington bearings clean.
this converter is out of a 42RLE
truck came to my shop customer installed a salvage yard unit, with a used converter he bought on ebay.

advice... dont cheap out on a converter, have one built for your application, ATI, Pro torque, do excellent work, great customer support and have been in business over 30 years

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Short of cutting a converter open, there is now way to know if it's clean or not or if anything else is wrong with it. Crap (clutch material for example) gets stuck in the pump and impeller vanes and is impossible to clean them out properly without cutting open the converter.
In my opinion, used converters are cores or good door stops.