having never seen a kingpin 60, i was wondering if an avalanche kingpin 60 arm would fit on my kingpin 44.

uh, no. You have better odds of a Toyota hi steer arm fiting than a D60 arm.

What year king pin 44? Make?

The Kin Pin 44 had the smaller u-joint. Are you sure you wnat to "bulid" this axle? Thinking good money after bad.