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I had the exact same problem, I just thought my cab was bent out of shape. I used (seriously) a port-a-power hydrolic tool with a heavily padded 2x6 chunk of wood to press it in. There are pictures in my build thread (in signature) for reference. I can tell you with confidence I have mine installed correctly, and while all the tips in here are very good, I tried all of them. I think the rubber is thicker, the glass is also slightly larger, and it makes for an incredibly tight squeeze. Probably a good thing for leak prevention.
I am probably full of crap, but if that was a 53-56 gasket, which I know it isn't, I would say that gasket is backwards. They don't show a picture of the gasket in the early years catalog but in the 53-56 catalog, Mid-Fifty shows a picture of the gasket you can use to compare to your gasket. Below is a excerpt from their catalog which is good information. On another note I see in your picture that the gasket seam is on the driver's side, it really doesn't matter but for only aesthetics I would put the seam in centered on the bottom (or top if you prefer).
STANDARD REAR WINDOW Please read this! Rubber looks like this • The rubber is the same all around, there are no corners • The standard rear glass is larger than the opening • The standard rear glass is installed from INSIDE of truck • You are pulling rope from OUTSIDE of truck (B) • The larger part of the rubber (D) goes INSIDE truck • The smaller part of rubber (C) goes OUTSIDE truck If you install it backwards, then call and tell us there is something wrong with rubber or that glass is too big for hole, etc well then... We know you did not read the directions, and, you owe us lunch. If you are a professional glass installer, we will be expecting dinner NOTE: Wrap around rear window installs like windshield, both are installed from outside of truck. In this order; rubber on glass, trim in rubber, entire assembly into truck, from the outside! (C) Lip outside cab (A) Glass groove (B) Cab groove Rope goes in this groove (D) Lip inside cab.
Here's a picture of the seal from the Mid Fifty catalog that truckeemtnfords mentioned:
I know your truck is not a 56, but something from the shop manual I thought might help:
" Insert a piece of cord (CHALK LINE) around the inner lip of the weather strip, allowing both ends of the cord to overlap. Apply liquid soap around the innerside of the weatherstrip. Posistion the glass in the window opening from inside the cab, and hold the glass firmly against the body flange while an assistant, outside the cab, withdraws the cord. After the cord is pulled loose. Strike the glass with the palm of your hand to seat the weatherstrip over the body flange."
Myself, I thought the mention of using chalk line was interesting. Would its smaller diameter help?
Here's a picture of the seal from the Mid Fifty catalog that truckeemtnfords mentioned:
I know your truck is not a 56, but something from the shop manual I thought might help:
" Insert a piece of cord (CHALK LINE) around the inner lip of the weather strip, allowing both ends of the cord to overlap. Apply liquid soap around the innerside of the weatherstrip. Posistion the glass in the window opening from inside the cab, and hold the glass firmly against the body flange while an assistant, outside the cab, withdraws the cord. After the cord is pulled loose. Strike the glass with the palm of your hand to seat the weatherstrip over the body flange."
Myself, I thought the mention of using chalk line was interesting. Would its smaller diameter help?
Thx, yes I tried a smaller diameter cord, but the problem is that I can’t get the gasket deep enough into opening for the rope to pull the outside lip over the opening.
as for striking the glass, I used my palm, then a rubber mallet, no luck.
The more I look at it I still think the gasket is backwards. Put the chord in the left grove from your picture in post #9 and rotate the back window with the gasket attached 180 degrees so the glass will actually be inside the cab (after it get pulled into place) and that gasket lip will get pulled over the pinch weld.
Got the glass from Chuck’s trucks today. It was 1/16” smaller, top to bottom compared to the LMC glass. I installed it myself in about 10 minutes. 3 easy steps…
1) put the gasket on the glass
B) put the rope in the gap
4) sprayed soapy water on it
Z) pulled it in with the rope
The glass shop tried many options with mine and broke a few
Use the old rubber seal vs a new one?
Take a flap disc and make the edges smaller/smoother
Drink a beer and try again later
Well…read the thread
The glass from LMC was about 1/4” too big. It’s tempered glass so there’s no way the trim it down. Chuck’s trucks had his guy make me a correctly sized window and it went in like it should. It’s all good now.
I thought you said it was a 1/16th in the difference..
Got the glass from Chuck’s trucks today. It was 1/16” smaller, top to bottom compared to the LMC glass. I installed it myself in about 10 minutes. 3 easy steps…
1) put the gasket on the glass
B) put the rope in the gap
4) sprayed soapy water on it
Z) pulled it in with the rope
I thought you said it was a 1/16th in the difference..
Got the glass from Chuck’s trucks today. It was 1/16” smaller, top to bottom compared to the LMC glass. I installed it myself in about 10 minutes. 3 easy steps…
1) put the gasket on the glass
B) put the rope in the gap
4) sprayed soapy water on it
Z) pulled it in with the rope
I'm having the exact same issue with LMC back glass and seals, the truck had no glass when I bought it, so I have nothing to compare. I guess I will just go ahead and order one from Chuck and save the frustration. Fingers crossed the front and door windows fit!
