Anyone ever add a drain plug to a torque converter?

Draining a lockup converter isn't easy as one might think. Flushing a converter was at best SORT OF OK back in the 60's and early 70's when lockup converters didn't exist. Flushing a converter with cold solvent and relatively low pressure doesn't cut it. Yes, it will flush the oil, but that's about all. Any junk (bits of clutch material) that works it's way to the end of the pump and stator vanes, is not removed by flushing it. Of all the transmisson shops I dealt with in the past, very few had a flushing machine. As OUTASITE mentioned the lockup piston rides on the cover in the lockup mode so as he states be cautious where you drill. It's been a number of years since I worked in the industry, but having a quick look at the converter catalog I have, I don't see any factory lockup converters with a drain plug installed. The Factory must have had their reasons , as lots of non-lockup converters do have the drain plug.

JoePole1 said

Hey All. My 904 340 style converter has a drain plug in it. Nice. I am running it on a Magnum 360 and knocked the weights off of the converter. No issues there except you cannot drain it while attached to the Magnum flex plate but that is not the issue.
I recently acquired an A999 and there is no drain plug on the L/U converter. I want to flush or at least drain it and this is next to impossible without a drain.
Has anyone ever drilled and tapped a converter for a drain? I'm talking a small 1/4" brass plug. Nothing crazy

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