[sigshooter]

It is fairly easy, I have done a couple and one not too long ago.

Put the gasket on the windshield, lube the gasket with dish soap or something on the part that will seal to the cab. Place a small rope about the size of a lawn mower pull start rope in the groove of the that seals on the cab. Go all the way around the groove and over lap it. Next place the windshield in at the TOP of the cab ( you will need a couple people to help hold the glass up to the top and apply slight pressure in) start pulling the rope from the inside of the cab and pulling the Los of the rubber in place. A plastic "knife" and a metal pick such as a radiator hose removal tool helps in getting the rubber in place epically around the corners. Pull the rope all the way around until the glass is seated in.

Be sure and start at the top if you start at the bottom the glass will hit the over hang on the top of the cab and won't go in.

The are plenty of YouTube videos on putting in windshields and back glasses on 67-72 models. The concept is the same, watch a couple of these and it will all make sense

Good luck