How do I know the final drive ratio of my Muncy 4 speed? I know I should have counted turns when it was out, but now it is in and I am curious about the ratio. It is an early one, it has the extra shift cable holders cast into the case. It has bolted on cast shift cable holders for a Fiero. It has a sticker on it that says: 614DW M and a casting number that says GM CFM-7

Larry

What is your RPM at a speed in 4th gear? And what is your tire size? Give me that and I can tell you.

Nate

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1985 GT | 4.9 Allante | M17/MY8 Hybrid 4-Spd Muncie | '88 GT Cradle Swap

It doesn't drive yet, it is this one: engine

Ok then. Per this thread https://www.fiero.nl/forum/A...120111-2-112010.html you have an M19 which is a 4.10 final and 0.81 4th.

Nate

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1985 GT | 4.9 Allante | M17/MY8 Hybrid 4-Spd Muncie | '88 GT Cradle Swap

Thanks for the link, this should work out fine I think, the engine should touch 7 with the cam and springs, should be interesting. Larry