I don't know in California but I'm sure there is lots of places. Where I am up north I use Denny's Driveshaft and/or Quad 4x4. This is GM 1/2 ton. Pretty common stuff.
I prefer to use original Spicer ball joints others prefer replacement Moog or Raybestos. I also prefer Timken bearings all around.
The parts lists below is what I remember using. Actually found it all again by a quick internet search between the Timken and Spicer websites.
PLEASE VERIFY ALL PART NUMBERS YOURSELF. NO WARRANTY EXPRESSED OR IMPLIED
Spicer front ball joint kit (one per side): 706116X
Timken Front bearings:
Outer: Set 45
Inner: Set 37
Inner Seal: 442380
Spicer spindle bearing: 706527X ( This is a kit that includes the bearing and one type of seal set. I could not find individual piece numbers. The seal kit may or may not be correct for you truck. Depends on the Axle stub slinger size. It could be either 2" or 2 1/4". They changed very late '72 and also with a 40 year old truck could be either in there now ).
Rear axle Timken bearings:
Bearings #6408
Seal #8835S
Or a Kit
TRP1559TV
As far as the service. Ball joints will have to be pressed both out and in. I used a hydraulic floor press. Cheap harbor freight style I already have in my garage. You can buy one of those manual ball joint press kits that look like an oversized C clamp. Or you could just go to the back door of some garage, give the guy $20 and he would likely do the pressing out and in for you.
Rear Axle bearings / seals need pulled out and pressed in. You can probably get them pulled out with regular tools in your tool box and tap in the new ones using the old ones you removed. This axle is very easy.
Front Axle bearings / seals need pulled out, races pressed back in. There is a few more small parts because of the locking hubs and the spindle. The Inner is held in by the Inner seal. The outer is held in by a 3 piece nut lock washer affair that sets the pre-load on the bearings. Spindle bearing and seal is an easy pull out and tap in. Can't do any of this until you remove the locking hubs first.
I highly recommend visiting the spicerparts dot com website and doing a manual search to find these 2:
"Spicer Models 30 and 44 Service Manual - Internal Type Front Axle Hub Lok"
(everything you need for the locking hubs)
"Spicer Axle Maintenance Manual Model 44 - Front and Rear Carrier Type"
(this will help with the ball joint service especially the reassembly of the knuckles to the axle housing. the correct tightening order and torque is required to get the ball joint pre-load set correctly)
Search here for both these manuals.
http://media.spicerparts.com/media
The Dana 44 front and GM 12 bolt rear were used in every 1/2 ton Chev truck between the late 60's getting in to the late 70's / early 80's. Any old school mechanic in your area probably has serviced lots of these and be a good resource.
I never did it myself till recently and did it with the 2 service manuals I suggested for the front so it isn't that hard if you take your time and study ahead.
The rear bearings were done when I paid someone else to rebuild my rear end but they are a very basic pull old out and tap new in.
I would also suggest reading through areas of the two build threads linked here. Some info there. I referenced them because they did it before me when doing my front axle. You could check my build thread linked in my signature there is some stuff there also but honestly I didn't put as much detail in mine as Brad and Mike did.
http://67-72chevytrucks.com/vboard/s...d.php?t=645076
http://67-72chevytrucks.com/vboard/s...d.php?t=628612
Good luck with whatever you decide to do. Wow that was a lot of typing !