What's the concern with the trans? Seems to be used across Ford and GM (joint developed) in some high horsepower vehicles. Sure has a lot of gears, but was built for the power.
I dont know about current production quality,
But they used to be Chinese Nankang MT-82.
I had a handful of new GT's in the day fro early 80's through late 80's.
IMO only the Warner T-10 was solid - all the
T-5 super came apart at various time for various reasons.
and that was with the low horsepower
But I have rotten luck. I'm sure you'll be fine.
Plastic oil pan and plastic bung plug on that yote puppy. - NO FIELD BOMBING or JACKIN