8.75" 2pc Side Gear Axle Spline Engagement?

Each gear is 3/4" thick. Outer gear is fully engaged, inner gear is .425" (7/16") engaged.

425hp, 4.10 ratio, 3300lbs with Bear's Pro Axle.

Is 7/16" enough, this is with the retainer behind backing plate against housing end flange.

Putting it on the backing plate face will lose another .1025", brake offset seems ok.