please answer these stock interior questions on a 1969 427 corvette

[TFranchini]

The rearview mirror does it have a gray rubber trim or was it black on a bright blue interior? The shift knob on the 4 speed was it black steel or stainless steel color? They said it was a m21 how can I make sure? How can I get a build sheet on this car? How can I check if it is a posi rear? The window hanldes were black or clear on a bright blue interior?

If you still have the original gas tank, the build sheet should be glued on the top of the tank towards the left of center. You need to drop the gas tank in order to see it. It will give you all the options the car was built with, including what kind of transmission and what the gearing is on the rear end.

Below is my tank and this is what it should like. :D

[JmpnJckFlsh]

The rearview mirror does it have a gray rubber trim or was it black on a bright blue interior?
The shift knob on the 4 speed was it black steel or stainless steel color?
They said it was a m21 how can I make sure?
How can I get a build sheet on this car?
How can I check if it is a posi rear?
The window hanldes were black or clear on a bright blue interior?

Chuck Gongloff is the 69 expert, but I will tell you what I believe to be correct for 69, and Chuck can straighten us both out. :D

Rear view mirror trim: Gray rubber for all interiors.

Shift knob: Black chrome.

M21: Only way to be completely sure is to count the teeth on the input shaft; maybe some one can provide the details. There will also be some "rings" cut into the input shaft splines right behind the pilot end: two rings = M20, one ring = M21, no rings = M22. IF the transmission is the original and has not had the internals altered, the stamp on the right side rear case flange will have a suffix letter on the end that identifies the gear ratios: A = M20, B = M21, C = M22.

Build Sheet For Your Car: If a copy isn't hidden behind the dash, somewhere in the frame, or glued to the top of the gas tank, the build sheet for your car can't be had...it's unobtainable.

Positraction ID: The gear ratio and positraction id is included in a two letter code in the stamp on the bottom of the housing. For example, if your car is a 427/390hp (L36) with M21, the standard rear axle ratio is 3.36:1. The positraction differential build stamp would include the letters "AU". In fact, the spec books appear to indicate that ALL 427 differentials were equipped with positraction.

Window Crank Handles: Window crank handle knobs for 68-72 Corvettes are black for all interiors. Full size Chevrolets of this era had clear knobs on an identical window crank handle, and you will see these used as functional replacements. They are not correct for Corvettes.


[Modified by Chuck Sangerhausen, 9:17 PM 11/2/2002]

[Chuck Gongloff]

Agree with everything ChuckS said. The only thing I would add as a point of clarification is that all the mirrors (day/night) have the gray trim around the perimeter. The little vinyl gizmo that covers the stem of the mirror....up on the header....is color coordinated to the interior.

And.....other than finding your "tank sticker" glued on the top of the gas tank, OR finding another copy of this build sheet stuck up behind the dashboard...in a frame rail....under the carpeting...etc., there is NO way to get a duplicate from GM or any other source.

There is ONE exception. If your Corvette was originally delivered to Canada, this info IS available from GM of Canada. Chuck :)