What to do to make a T1 tranny handle 300 FtLbs of torque?

[Bruce2]

Originally Posted by lazylongboarder

Ok, you want a straight answer, chew on this. Drag boxes for 500 bones handle 150 lb/ft of torque tops. The 901 will handle 250 lb/fts reliably. A 915 will handle 350 lb/ft of torque tops. A 5 speed G50 from a 964 will handle 600 lb/ft of torque. A 6 speed G50 will handle 800 lb/ft

Where did you get those stupid numbers? Cite the scientific testing that was done to determine those cutoffs. They look like SWAGs to me.
I can build a Type 1 gearbox that will easily take 200ftlbs for less than $500.

Whether a trans can withstand a certain peak torque has very little to do with the design, and much more to do with the idiot behind the wheel.