My Fairmont has had Strange axles for 35 years now. 33 spline back when it was an automatic with transbrake, but when I put the Jerico 4 speed behind the 428,21 years ago, I went up to 35 spline, because the 33s were showing a bit of spline twist. That said, when I built my 85 Mustang 302 stickshift Stock Eliminator car, I found a new set of 31 spline Moser axles advertised locally, so I used those in the 8.8 rearend. I broke a couple of ring and pinions,and twisted the housing, but never hurt the axles. Even when I stopped racing in Stock, and put in the 331 SBF for 4 seasons, which ran low 10s, dropping the clutch at 6600, mid 1.3 60 foots, I never hurt those 31 spline Moser axles. I have 31 spline Dutchman axles in my 59, and I have been happy with all 3 brands of axles that I have used. Mark Williams are generally regarded as the highest quality axles, but I have no complaints with any of the brands that I have used.