C3 Engine, Trans, Rear end options

[Joseph H.]

Hi,
I have come to find out my 69' 350/350, M20 does not have the original rear end. One of the previous owners has dropped in a 3.08 posi from the late 70's. My question is this, What drive train combinations were offered for the small block? I understand that the gear ratios were 3.08, 3.36, 3.55, 3.70 and 4.11. Since my engine and trans are original, what would have been offered from the factory for the 350/350, M20? On the web I found a data sheet that indicated that only 3.36(AM) or 3.55(AN) were offered for my combo. Is this correct? In my quest to find the correct dated rear end I want to make sure I am looking for the correct gear ratio also.

Does this make sense?

Thanks,
Joe

[John M.]

Re: C3 Engine, Trans, Rear end options

I just inquired on this as well for my 69 L46 M21.

The M20 offered 3:36 standard with the 3:55 optional performance.

The M21 offered 3:70 standard with the 4:11 optional performance.

I'd rather have your set-up than the choice between a 3:70 or 4:11.

[Joseph H.]

Re: C3 Engine, Trans, Rear end options

John,
Thanks, that is the info I was looking for. The difficult task will be to find the correctly dated rear end. I actually do not mind the 3.08, but want to get the vehicle back to what it was supposed to be. As close as possible anyway and not drain the bank.

I have owned the car for a year and have learned so much already, scary.

Joe