Marty, I'm not too sure if there's such a thing as a heavy duty torque converter. I can't say that I've ever heard of one. The type of torque converter is, as far as I'm aware, specific to the make-model and transmission of your vehicle.
A torque converter usually has a long life though sometimes they can develop faults such as leaks. Repair/rebuild is a specialised requirement and outside the scope of the home mechanic. It's only a specialised company that can do anything with them.
A second-hand torque converter is an option - but remember they are second hand and come with no guarantee. It may work fine for a few years - or a couple of weeks. There's no way of knowing which.
The link below is for torque converters on Ebay. Maybe contact one of the suppliers and ask their advice?
torque converter
You can also do a Google search for 'reconditioned torque converter'. This is a slightly cheaper option (if you can find a reconditioned unit) and will come with some form of guarantee.
If you're doing the work yourself - well done! It's a big, messy job. I've done a few over the past 40 years.
On a personal note - I'm in the UK - many, many years ago I had a problem with the torque converter on a 1969 Rover 3500 V8. I didn't have much money at that time, and fitted a second hand torque converter. It took 2 days to complete the job.. which wasn't easy...
20 miles after fitting the second hand torque converter I became aware of torque converter problems ... and yes, I fitted another second hand torque converter which lasted a whole 4 weeks...
I'm sure you get the idea... New or reconditioned with a guarantee is the only option. My friend in Ohio assures me that the devil punishes people by making them fit second hand torque converters to their cars ... He's from Ohio, he doesn't tell lies..
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