Does anyone know if the wheel studs can be removed from the hub on a 4 stud sierrra rear? and how?

Ideally a press, or push them out in a vice with a socket behind.

If your putting new ones make sure they are pushed right in against the hub face.

Screw on the nut, hit with hammer. When pressing in new ones make sure you line up the splines or you may enlarge the holes in the hub.

Caution needed if using a vice - see picture here http://www.locostbuilders.co.uk/viewthread.php?tid=180812

+1 pressing them

not too difficult once you've removed the flange from the hub - just remember a get a new hub nut before you take them apart
(if you're changing the bearings and seals anyway they come with new nuts)

[Edited on 15/8/2013 by mcerd1]