school me on an axle beam

here is part of my knuckle collection:
IMG_2146.jpg


I have both a spindle style 2wd knuckle as well as a unit bearing 2wd knuckle but it has a weird hole in the steering arm(see pic below), for my 2wd beam I used a 4wd knuckle with a stub shaft as it does not have that hole

IMG_2148.jpg
 
I have both a spindle style 2wd knuckle as well as a unit bearing 2wd knuckle but it has a weird hole in the steering arm(see pic below), for my 2wd beam I used a 4wd knuckle with a stub shaft as it does not have that hole

IMG_2148.jpg
are you talking about the hole halfway between the upper ball joint, and the hole for the steering? im pretty sure that isnt 2wd specific...
 
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