[keith k]

Originally Posted by Baron Von Zeppelin

And just for reference sake,
the RamIV 4spd from Van Nuys that i have a Buildsheet on is M20 / 3.73

As far as I know, every RAIV car had 3.73s, and if it was a 4-speed it was an M20. I don't think the M21 was available on a IV T/A in '70.

Originally Posted by Baron Von Zeppelin

In case this has gotten confusing
Or if anyone came in late

What we are crunching is the fact that some RamAir3 70 TA's with 4 speed and 3.73 Axle Gears show it plainly on the Invoice (including the mandatory HD Radiator) -
and some documented 3.73 cars do not - and only show the HD Radiator

We are trying to possibly nail down "why"

The "why" is looking like it relates to whether the car was :

3.73 with M20 Wide Ratio 4spd (Performance Axle Option and HD Rad on Invoice)
or
3.73 with M21 Close Ratio 4spd (Just the HD Radiator on Invoice)

That seems like a very logical hypothesis. When I have a chance, I will have to dig through my stuff and see if it all "makes sense" through that lens. Agreed - sure would be nice to have more build sheets and GM Canada docs to cross reference!