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Thread: TRANS ID

  1. #1

    TRANS ID

    A friend of mine is converting a '67 Firebird from an auto trans to a 4 speed. He is in the process of rounding up all the necessary parts. He is going to look at a trans on Wed and wants to know how to identify a Muncie from a Saginaw or a B/W T-10.

    I told him the Muncie would be all aluminum, but beyond that I don't have anymore advice.

    I think some Muncies have a groove machined into the input shaft to denote a wide ratio from a close ratio, but I'm not certain of that.
    Anyway, I know some guys on this site can help me help him.

    How do you distinguish a Muncie from the others, and how can you tell a M-21 from a M-22? And any other advise you can offer.
    Which would be better in a street driven, almost stock Firebird with 2.73: gears in it.

    Thanks in advance for your help.
    Tom

  2. #2
    Senior Member RACING JUNKIE
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    4,143
    muncie has 7 bolts in the side cover the BW had 9 and as you said the saginaw was iron.

    there is a web page somewhere with a bunch of info on identification of them...I have seen it posted on another forum before...might do a google search.

  3. #3
    Senior Member RACING JUNKIE
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    I have a Richmond T-10 in my 66 Impala.Weighs right at 4200.Got a 2.73 gear in it.My first gear ratio is right at 2.89 I believe.The deepest I could find.Motor makes 385 horsepower and a little mote torque.Car is real peppy to be geared so high and heavy.I love it.Been abusing (seriuosly)that tranny since I bought it new 43,000 miles ago.Not one hiccup.Knock on wood.
    "The problem with quotes on the Internet is that you cannot confirm their validity"- Abraham Lincoln

  4. #4
    Senior Member MASTER BUILDER
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    May 2003
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    Owingsville, Ky
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    The M22 Munci has a fine spline input shaft and the output shaft is the same size as the T400. The M21 have the coarse spline and the output shaft is the same a T350/powerglide. The double rings on the input shaft usually indicated a close ratio. I had a single ring which had the lower 1st gear ratio which made it nice for the heavier car.

    Most of the M22's have the straight cut gears and would be a little noisy for the street, but I do know that in 1973 the Corvette had a fine spline input and T400 output with the heli-cut gears. I purchased it from the owner of the Vette when he went to a Doug Nash 5-speed. That was the best Muncie that I ever owned and when I purchased it, it was in pieces and several buckets.

    Stay far away from the Saginaw, because they are super weak. The T-10's are good and I think that there was 1 version that even came in an aluminum case.

    I would recommend a steel flywheel and a shatterproof, if you can. I had a flywheel explode on me once and luckily I didn't get hurt, but it is like a grenade going off.

    Good luck,
    Bill M

  5. #5
    Senior Member RACING JUNKIE
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    He's right about the Saginaw.Mine broke wothout even trying.That's how I ended up with the T-10
    "The problem with quotes on the Internet is that you cannot confirm their validity"- Abraham Lincoln

  6. #6
    Senior Member MASTER BUILDER
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    waynesburg, ky
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    im in on the shatterproof i had a pressure plate explode in a 4x4 on me lucky me i still have my foot as it cut the gas pedal out from under my foot.
    HOLY [email protected]* WHATS BROKE NOW

  7. #7
    Senior Member RACING JUNKIE
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    Independence, Missouri
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    Scattershield!

    suicidebomb
    No matter where you go, there you are.
    **IN GOD WE TRUST**

  8. #8
    Senior Member DYNO OPERATOR
    Join Date
    Nov 2006
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    NC
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    Doesnt hurt to have a frt driveshaft loop too!!! David.


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