E550 conversion Help

[Zokey]

I'm new to the group and hopefully can get some help.
In need of someone or place that can make me a pitman arm or something that uses a 41mm 36 spline output shaft the E550 is a odd one out.
Also when changing the tail housing the van used a great type sensor the 4x4 uses a tone ring anyone know if changing the ECM from the truck would fix the shifting issue transmission is a 4R100 with 7.3.
Any one had either of the too issues I'm having.
Thanks