M-20 with L-78 or L-72 & deep gear -How?

[YENKO DEUCE REGISTRY]

I agree with Wilma there, M20 was standard unless you ordered the M21 or M22 regardless of rear gear.

[NCGuy68]

And I agree with Marlin.

The paperwork on my Van Nuys 68 Z28 shows the M21 and 4:10 gear as optional selections. Standard Z28s' usually came with a M20 and 3:73 gear.

On the other hand, I have seen a documented 68 L-78 with a 3:07 non-positraction gear and a M22. Seems that GM cooked up some unusual combinations at the time. Original documentation and/or carefully decoded numbers seperate the originals from the clones.

[Paul_S]

Thanks for the responses. Keep'm coming.

I was looking on CRG's site for info. They don't get very detailed, but they do list what was available in a chart. (I'm not sure how accurate it is, but it's getting a little closer.) I'd like to see some info and details from original documents to back it up and for the other years/cars.

For '67
Z28: M-21
L-78: M-13 (3-speed), M-21

For '68
Z28: M-21, M-22
L-78: M-13, M-21, M-22

For '69
Z28: M-20, M-21, M-22
L-78: MC1, M-20, M-21, M-22
L-72: M-21, M-22

[Kurt S]

I was going to do some digging before I posted, but the above post drew me in.

That info is correct for Camaros (except L72 could get M20's, I'll correct that). I'd need to do some digging to find the backing documentation, but the jist of it is the M20 wasn't available in a Z or L78 in 67 or 68. In 69, any Camaro could get an M20. Not sure of the logic behind it and have no idea on other models.