wayne
3/4 ton status
Ok, who is running them and have they held up? I am going to regear and I figure that is a good time to upgrade the outers.
1541 is what Spicer builds their shafts out of.
Upgrading the outers is a great idea, they are far and away the weak link on a front D60. IMO Alloy USA or Yukon (both are a little over $100 per shaft and are made of 4340) offer much better bang for the buck than Spicer.
It also depends on the tire size. I fear for my (non-neckdown) Spicer inner shafts and am kinda afraid to pull them out to see twisted splines or stretched yokes (though I will obviously pull them to make sure they're good for this season, I just don't want to spend $$ on new shafts).