Older cars have thicker glass. I wish! My 1979 Fairmont had the thicker rear tailgate and side glass (2 layers of tempered with a vinyl skin sandwiched in between) until some kids shot them out with a BB Gun. The newer stuff is a 1/8" thick tempered glass. The older glass on the passenger side is about 5/16" (twice as thick) Less road noise, etc. Well since older Mustangs shared the same types of glass, the problem isn't just the glass, but the fact that a lot of modern glass installers don't know how, if you're lucky enough to find a replacement. Here's a DIY on the process. Works for any classic/older car. The Mustang Hatchbacks had fixed glass too, so this tech is portable to a Fox Wagon or any hatchback tailgate: http://www.mustangmonthly.com/howto/mump_0902_how_to_replace_windshields_and_backlights/index.html
Thanks for the link Norman. I have been pondering on what to do with my front windscreen. I was on my way to IL State U in Normal, IL. Its about a 2.5 hr drive south from were I'm at in the subs of Chicago. When I drove the '78 down there, it rained HARD. To the point you could hardly see what was in front of you. I discovered a seal leak on the top of the windscreen, nice small "drip drip drip". So thats my next plan on the '78 for this coming spring. I don't want some mah-goo coming out, trying to reseal it, and cracking or braking something while doing it.:banghead3:
Make sure you've got a buddy with a few clues and willing to take your lead on his side. Those things are heavy and can crack if one guy twists too hard to break the old seal. Also, you need a warm shop and a big, deep pot of hot water (not boiling) to warm up the sealant tube. It starts to harden in the tube if you're working in less than 65F temps.
