Rear end advice for racing with a 4 speed

Illahe said
That goes without saying, yet when abrasive blades are used to cut they create heat annealing the surface area within the heat affected zone.

Next time I narrow an 8 3/4 I'd prefer to order custom axles from Mosier.

I've got two narrowed nines, one with Strange axles, one with Summers bros.
I would not build a narrowed rear without good custom axles.