Which Trans do I have?
Melting Slicks
Joined: Mar 2005
Posts: 2,094
Likes: 298
From: Midlothian VA
Casting numbers will get you only so far.
What you need is the numbers stamped into the case (if any) and the ratios from between the input and output shaft.
And, just because "it came out of a 69 Camaro doesn't mean it started life there.
Your main case casting number #3851325 is likely from a 64-65 vehicle.
What you need is the numbers stamped into the case (if any) and the ratios from between the input and output shaft.
And, just because "it came out of a 69 Camaro doesn't mean it started life there.
Your main case casting number #3851325 is likely from a 64-65 vehicle.
Thread Starter
Drifting
Joined: Apr 2002
Posts: 1,743
Likes: 37
From: Stockton Ca
You are correct!
I'm upgrading to 5 sp and would like to sell this trans first.
The Hurst shifter had to be pieced together from two kits to fit my 74.
It is in the car so a prospective buyer can go for a test drive!
Asking prices are over 2K.
I'm upgrading to 5 sp and would like to sell this trans first.
The Hurst shifter had to be pieced together from two kits to fit my 74.
It is in the car so a prospective buyer can go for a test drive!
Asking prices are over 2K.
Melting Slicks
Joined: Aug 2011
Posts: 3,124
Likes: 259
ALL you can be sure of is that it's either a 1964 or 1965 Muncie.
They are NOT the most desirable Muncie but if the stars line up for you - a snowballs "chance" it might match someones car.
Until you get it out YOU won't know what ratio Muncie it is .
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Thread Starter
Drifting
Joined: Apr 2002
Posts: 1,743
Likes: 37
From: Stockton Ca
I know it is a cr muncie, that is why is want a wr 5 sp.
The M22 didn't come out until later.
What else could it be?
My engine is a tq monster, it will easily pull the gaps between gears.
The tall first gear is a pain even w/3:55
The M22 didn't come out until later.
What else could it be?
My engine is a tq monster, it will easily pull the gaps between gears.
The tall first gear is a pain even w/3:55
Melting Slicks
Joined: Aug 2011
Posts: 3,124
Likes: 259
M22 has the same ratios as an M21.
Yeah if you had a M20 - WIDE ratio you wouldn't have a problem pulling away in 1st.
Your engine must REALLY be built up - not to be able to deal with a 3.55 rear end BUT you say it's a torque monster ?
Yeah if you had a M20 - WIDE ratio you wouldn't have a problem pulling away in 1st.
Your engine must REALLY be built up - not to be able to deal with a 3.55 rear end BUT you say it's a torque monster ?
Last edited by QIK59; Feb 26, 2025 at 07:05 PM.
Safety Car
Joined: May 2001
Posts: 4,757
Likes: 1,647
From: Fairfax Virginia
I have a 1968 C3 with its 427 BB pushing 560+ hp and a ton of torque, and it works great with my M21 and the 3.36 rear axle ratio. The car accelerates "violently" and will spin its tires until they pop with a 3.36 rear and a bit of power.
That car should be able to cruise all day at 60 mph and last a hundred thousand miles doing so with that combination. While cruising at 70 mph I can drop a gear and be over 100 very quickly.
If the shifter is "loose" and no longer precise, then buy the parts and rebuild the shifter. If that is not enough, try the Hurst Shifter on the M21, that is a great combination. I have the Hurst on my C3 and it is wonderful, the shifts are precise and the throws are shorter that with the factory linkage.
Finding a 5 or 6 speeds gear box designed to handle my Torque levels would be a very expensive. If I break an original part there are people who will sell me a better style original part which bolts right on my Corvette.
That car should be able to cruise all day at 60 mph and last a hundred thousand miles doing so with that combination. While cruising at 70 mph I can drop a gear and be over 100 very quickly.
If the shifter is "loose" and no longer precise, then buy the parts and rebuild the shifter. If that is not enough, try the Hurst Shifter on the M21, that is a great combination. I have the Hurst on my C3 and it is wonderful, the shifts are precise and the throws are shorter that with the factory linkage.
Finding a 5 or 6 speeds gear box designed to handle my Torque levels would be a very expensive. If I break an original part there are people who will sell me a better style original part which bolts right on my Corvette.
Melting Slicks
Joined: Aug 2011
Posts: 3,124
Likes: 259
Now where should he go to buy PARTS to rebuild a shifter ? I have some old shifters that I need parts for ?
What makes a Hurst shifter on a M21 as opposed to any other tranny a "great combination"- M20 or 22 wouldn't be as good ?
What makes a Hurst shifter on a M21 as opposed to any other tranny a "great combination"- M20 or 22 wouldn't be as good ?
Safety Car
Joined: May 2001
Posts: 4,757
Likes: 1,647
From: Fairfax Virginia
There are Corvette suppliers who will sell you a rebuild kit for your factory Shifter. Zip products sell the 1969-1982 shifter rebuild kits for $33.00 It was mostly small parts that consisted of bushings and spacers. It is a fairly easy swap of the older parts for the new fresh parts.
The Hurst shifter worked really well on my M21 transmission. I personally have not tried it on a M20 or an M22 or I would offer my opinion on those setups with a Hurst. If they share external dimensions then they might work just fine and be part of another great combination.
I personally installed my Hurst shifter in a matter of a couple hours. It went on very easily, the setup and adjustments were a breeze. The difference in the how well they work is amazing.
The Hurst shifter worked really well on my M21 transmission. I personally have not tried it on a M20 or an M22 or I would offer my opinion on those setups with a Hurst. If they share external dimensions then they might work just fine and be part of another great combination.
I personally installed my Hurst shifter in a matter of a couple hours. It went on very easily, the setup and adjustments were a breeze. The difference in the how well they work is amazing.
Old Pro Solo Guy
Joined: Dec 2017
Posts: 8,079
Likes: 4,431
From: Marlton NJ
The bolt pattern where the shifter arms attach to the trans changed over the years. Some trans had studs there (early??) and others had bolts. Different levers. That's all.
We even used to drill / dremel out room for the bolt to alter the levers and make them fit. The studs and their correct levers had flat sides.
The rest of the Hurst shifter should be the same from 63-82. C2/C3. Maybe a diff handle on the C2s.
We even used to drill / dremel out room for the bolt to alter the levers and make them fit. The studs and their correct levers had flat sides.
The rest of the Hurst shifter should be the same from 63-82. C2/C3. Maybe a diff handle on the C2s.
Thread Starter
Drifting
Joined: Apr 2002
Posts: 1,743
Likes: 37
From: Stockton Ca
Need Info?
What rear end would come w/M21 and 327 engine?
I found #3868403 on the trans.
What is a running and shifting M21 w/proper vette linkage worth?
The original shift linkage was for the previous car.
I won't drop the trans until it is sold.
Then I can replace w/5 sp.
How can I tell what car it came from?
TIA
R
I found #3868403 on the trans.
What is a running and shifting M21 w/proper vette linkage worth?
The original shift linkage was for the previous car.
I won't drop the trans until it is sold.
Then I can replace w/5 sp.
How can I tell what car it came from?
TIA
R
