Best transmission street/strip

Turbo 400. Cheaper to build to withstand high HP levels.

...and thanks for your service.
Enlighten me how it is cheaper to build including an adapter bell housing please. The odd turbo 400 can blow up just like a 727,
It has a sprag that fails as well if you do not do your burnout correctly just like a 727.
727 is plenty strong for high horsepower, especially a small block.
IMHO.