Ken Thoma Video
Dedicated to the Memory of Ken Thoma.
video link
http://youtu.be/wnp13VdlA8w
No matter what bearing puller you use, you should look at this video to see all the steps live on how to service the GMC Bearings.
Thanks to Bdub, you can run the video here
http://video.google.com/videoplay?docid=9107037595711370681
Look for all sorts of neat tips
See his bearing greaser
How do you test the bearing spacing ?
If you want to see more of Ken's bearing puller, here is a step by step article
http://www.gmcmotorhome.com/tech/front_bearings/index.html
Watch this video, you will learn a lot about bearing service