Wyle E

It appears that 1/2 ton Dodge trucks share front steering knuckles from 1973-1980, along with upper and lower (3000-3600# axle) control arms

3634908 and 3634909 knuckles

There are differences in the Arm-steering- knuckles between at least 73 -78 along with 79-81

1973 3634920-1

1974-77 3634924-5

1978 3634924-5

79-81 4088048-9

I can parse through this some more later if you want

Red