My car has a Mikes Ultraglide in it from before I bought it so I don't really know if the Mark William tranny yoke is a steel Spicer or which brand and exactly the type of material
It has taken a lot of abuse form me though, 1.27 60 Ft times so far at 2750 lbs.
I had forgotten how hard a hard leaving car can be on your back if you don't push yourself back into the seat before letting it eat