In and out play is normal with C clip axles, it's the nature of the c clip itself.
I'd do the outer seals at the least, bearings if you can get good ones cheap enough but they do last much longer.
Pinion seal I'd do it, but only the right way...not spin the nut off/spin it back on. While the axle is out of the truck, remove carrier and use new crush sleeve and set to correct used bearing preload. I've had bad experiences with just running the nut on, but YMMV.
Last edited by buckgnarly; 12-10-2010 at 12:50 PM.