Strength of a a-833 with a 25 spline output

I ran 11.30's 1/4 & 7.00 in the 1/8 w/ 1.49 to 1.55 60' time in my '70 Swinger w/ 10.5 x 28 x 15 slicks with a 23 splined A-833 4 speed...Never had any front shaft problems...Sure had to buy the good rear end pieces though...LOL...Lee