Low gear set 904, pro’s and Con’s

I am not aware of the Low gear being any weaker than the standard ratio.

Currently and last year we have a transmission that is the spare with the
production low gear in our Superstock 340 Duster (3400+ lbs.) instead of
the straight cut aftermarket.
It makes approximately 600 HP and run High 9's and Low 10's and we have not
broken the gear set.