I never knew anything about it being a grey area until Keith brought it up.
Knew mine had the Performance Axle charge, so looked through files for others.
I'm just in on it for the learning
George Carlin's car was told to be 3.55/M20 , with just the HD Radiator as an option.
Only have that partial invoice - no visible date on it.
Here is another, a Canadian Export, with HD Radiator option.
If we had the GM of Canada Report on this car it would spell out the Transmission ID and the Axle Ratio - but don't have that luxury on this example.
Maybe someone will recognize it and perhaps have the GM of C on it.
* i don't remember whose car this was or which tranny it had, at all *
