How strong is a T-5 transmission?

I've been wanting to try one for a while. I was seriously considering doing the swap in my dart until i saw the price of the sbm to t5 bell house prices. They are crazy expensive for a piece of stamped steel. Right out ridiculous imo! So I just stuck with the automatic. If I ever come across one cheap enough or in a junk yard I'm gonna buy it and see about making my own bellhousing. BTW the same bell house for a sbc is 1/3 of the price! Highway robbery!

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T-5 Bellhousing Adapter Plate For Slant Six | gillwelding
It says for slant 6, but there's no reason it couldn't be used on a small block bellhousing.
I think this is what @RustyRatRod 's using for his T-5, so he may have some first-hand experience with it.