Among other things, you need the WW2 jeep manuals to work on your Willys MB or Ford GPW.

You need to get the manuals if you don’t already have them. Buy ‘The Military Jeep Complete’ technical manual it includes TM 803, 1803A, 1803B. You might also consider the electronic version as well!  The electronic versions are a good bargain, print out the pages you need, take them to the garage, screw them up with grease and who cares ’cause you can print more. It is so very important to own these manuals because they tell you the basics of what you need to know. What grade oil to use? How do you service the brakes?
More advice can be found here.