I twisted Moser axels with 4.30 gear and spool behind my 3000lb car with about 525hp.60fts were 1.50.Now have a Dana 60 with 4.56 spool 35 spline axels,60fts are 1.44 looking for more.LOL View attachment 313458
I thought those were Strange axles you twisted. That's actually common for them, they twist a little and then take a set.
I twisted the stock 30 spline axles in my 4 speed Duster, went to Moser 30 splines and have been using them ever since but I also switched to an automatic. I had those axles in the Duster running mid 10's for over 15 years. I had them shortened and resplined and they are still in use in the Scamp.