When finding a replacement door glass for your C3 Corvette, there are a few things you'll want to consider before settling on a piece. It an arduous process to remove the actual glass from your door, so hopefully this guide will help you pick the right piece of glass before you dig into your door.
There are a few variances found in the shape of the glass, color of glass from the factory, and etchings found on the glass depending on your year and model of Corvette.
Coupe or Convertible?
First, you will want to make sure you have the right shape glass for your C3. The Corvette Coupe (option code Y37) was made for the full run of C3's (1968-1982), but from 1968-1975, Chevrolet released Convertible model Corvettes (option code Y67). The glass used for Convertibles (soft top and hard top) is shaped differently on the rear edge to accommodate the shape of the soft tops & hard tops. The angle cuts forward a bit and is not as square at the rear upper corner. Please refer to the picture below:
Here, you can see the rear edge of the glass is shaped differently between the two.
The glass for Late '69-1982 is very similar. From 1968-1974, factory glass came with an "AstroVENTILATION" logo towards the front of the glass. This is the main difference to note between early C3 and late C3 glass.
Again, the late C3 glass (1975 and later) do not feature this AstroVENTILATION logo. You can also determine what year the glass is from by reading the date code located at the rear of the glass, just above the door visibility line. Refer to the picture below for the locations of these two details on the glass:
"LOF" is the original manufacturer of door glass, and is "Soft-Ray/Flo-Lite" glass. The "AS-2" you see is the American Standard specification rating code for side door/vent and coupe rear glass (windshields wil show "AS-1").
The date code is the pair of letter at the right of these details. The first letter will indicate the month, and the second letter indicated the year. For this particular piece of glass pictured above, the date code reads "YJ" (October 1978). Refer below for the breakdown of months and years by letter:
OEM or Aftermarket?
While aftermarket glass come at a reasonable price, some replacement glass is not made to the same specification as OEM door glass.
Around 1980, LOF glass decreased in thickness (from the original 1/4" thickeness to around 1/8"). While looking at some replacement glass (Solex, etc), the actual thickeness of the glass is different, following this change for the late C3's.
The replacement glass measures just over 1/8" thick, while the original LOF glass is just about 1/4" thick! Keep this in mind as you shop for your replacement door glass for your pre-1980 Corvette.
We hope this guide to door glass comes as a help while shopping for replacement windows for your Corvette. Whether you have a Coupe or Convertible, getting the glass replaced is a project that will take time and patience. Hopefully this will prevent you from replacing an incorrect window with a correct piece!