Three Speed Manual

[Shyster7]

I recently picked up a bone stock 71 Monte that is in need of some basic maintenance.  She has a three on the tree and I'm planning to put a new clutch.  The seals are leaking so would like to also replace them, but I am having a hard time determining what I need.  Does anyone know what the model of transmission these came with and how I could determine what seals I would need for the job?

[cny first gen 71]

Depends on where it's leaking what seals you will need. I believe there is a number or tag on trans somewhere hopefully someone with a little better knowledge will chime in on this. That is a kinda rare find not to many out there. 

[Dtret]

I’m thinking it’s a Saginaw. 

[Shyster7]

Thanks guys!  Ill take a closer look and see if I can pull some numbers to confirm.  Looks like most of the leak is at the tailshaft for the yolk.

[cny first gen 71]

Tail shaft seal is an easy one to do.

[Scott S.]

If it's a Saginaw..... I'm thinking M20...... The model number should be stamped in the case at the front end transmission. 

[Scott S.]

Could also be a Muncie..... I guess it may depend on where it was built. 

[420ponies]

If it's cast iron, 3 spd . should have a tag on the side cover. Rear seal is easy fix. Great find! We Need pictures Please!

[Shyster7]

Thanks again everyone.  When I'm back at my dad's hobby shop I'll see if I can find a number stamped or tag.  Ill also get some more pictures.  The plan is to do some maintenance and make it a good driver again.  Ordered new seat covers and a front end rebuild kit.  Everything appears to be original so every bushing and joint is roached.  I got a receipt from 1985 when the original engine was rebuilt and a new paint job was done.  Both are pretty tired now.  Previous owner also had the original hub caps that he gave me.  Driving a manual on the column is a different experience

[420ponies]

Good to see someone who's younger then most of us here enjoying a First Gen Monte Carlo! And on top of that an anti -  theft First Gen! 😁😁 Sure looks nice from your pictures.

[Rob Peters]

Sweet looking Monte.  You should be proud to own it.  Being a 3 on the tree is very special and rare.  I would hang on to it for a long time.  When I was a kid there was a navy guy who used to come to visit my sister.  He drove an old 3 on the tree Mercury.  It was funny it was months riding with him before I realized it was a manual transmission because it shifted so smoothly it felt like an automatic.  I would have been sitting in the back seat so I didn't notice him shifting.    I picture a Monte being a similar ride experience.

rob

[Chevy Dave]

I don't know which transmission you have, but an M20 is a wide ratio Muncie 4 speed.

[Scott S.]

2 hours ago, Chevy Dave said:

I don't know which transmission you have, but an M20 is a wide ratio Muncie 4 speed.

That's what I figured out after looking further into it.... 

[Canuck]

Welcome! Great looking 71 Monte!

Here's info on how to decode the transmission.
https://www.firstgenmc.com/forums/index.php?/resources/decodingtransmission/

My understanding is that they are Muncie 3-speed manuals.

We would love to see you and your Monte Carlo at the FGMCC Western Meet next year.

[Scott S.]

Yes..... Welcome to the insanity.