464039-spindle
18027848-hub Only
Are you sure 464039 is just for the spindle? According here it is a kit that includes a seal bearing and race.
http://www.gmpartsgiant.com/components/1985-gmc-k1500~2-axle-asm-front-tk061100106-l05m64k10903.html
Also is this spindle the first or second design?
Small-Bearing Spindle-Inner-Bearing Journal Size: 1.78"
Stub Axle Spindle Bearing Kit Part# BRGBK1 $15.99
Hub Lock Nut Kit Part# BK6301653 $15.99 Needed only if your old ones are bad
Inner Wheel Bearing & Race set Part# BRGBR37 $18.99
Outer Wheel Bearing & Race set Part# BRGBR35 $16.69
Seal Part# NOS24898 $ 4.99
Big-Bearing Spindle-Inner-Bearing Journal Size: 2.00"
Stub Axle Spindle Bearing Kit Part# BRGBK1 $15.99
Hub Lock Nut Kit Part# BK6301653 $15.99 Needed only if old ones are bad
Inner Wheel Bearing Part# BRG LM104949 $15.99
Inner Wheel Bearing Race Part# BRG JLM104910 $ 9.49
Outer Wheel Bearing & Race set Part# BRGBR35 $16.69
Seal Part# NOS24898 $ 4.99
As you can see the only differance in the small and big bearing spindle is the inner bearing all the other parts are the same