Could someone give me an idea of what might be involved in converting my '67 F100 to 4x4? I know the front and rear gear ratios should match, but I don't have any clue whether a 4x4 front end/suspension/steering will bolt directly into a truck that wasn't manufactured with it. I understand there are parts to buy of course, but is it do-able without major modifications to the truck other that parts replacements?