I have a very small rock crack in my windsheild on my 87 4.2L Wrangler. It is in the upper passanger side and not very notcible at all. Total all the way across it is less than an inch, but yes it is slightly cracked. My question is will the spread? Like do I have to get it fixed or will it be ok.

 

It will spread. You can get it fixed though (probably, not sure) since it isn't on the drivers side, and it doesn't sound too bad.