help.....M20 or M21 - Team Camaro Tech
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post #1 of 10 (permalink) Old Jun 4th, 01, 06:03 PM Thread Starter
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well can any one help me make up my mind? any input.i heard that the M21 is not to good off the line when using 331 gears..as where the M20 is better using the same gears...oh, and any one here selling one? thanx,david
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post #2 of 10 (permalink) Old Jun 4th, 01, 06:15 PM
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Use the M20 with that tall a rear end. the M21-22 will be terrible to drive. If you don't have a trans now think about a ST10 they are much cheaper and have much better gear ratios.

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post #3 of 10 (permalink) Old Jun 4th, 01, 06:25 PM
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It's because the 1st 2nd & 3rd gear ratios are different. A M-20 has a 2.52:1 1st. A 1.88:1 2nd and a 1.46:1 3rd. 4th is direct.

Both the M-21 & M-22 have a 2.20:1 1st. A 1.64:1 2nd and a 1.28:1 3rd. 4th is direct.

I have 3:08's. I would rather have the M-20 with those gears because they are lower, which I need to get going with tall gears.

If I had lower gears, like 3:73's or 4:11's I would want the M-21, or better yet, the M-22, just because it has better gears. They have a taller ratio.

Any of this make sense? I hope so. Alot depends on your tire hieght also. This is general, alot has to do with how the car is setup.

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post #4 of 10 (permalink) Old Jun 4th, 01, 06:29 PM
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69 z-11

With your gearing you are going to be much better off with a M20. The lower first gear is going to make for much better off the line grunt and drivability. Also I have an extra M20 in the garage, E-mail me if interested. Also if anyone is interested I have a near new 11" centerforce duel friction clutch and pressure plate as well.

Good luck

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post #5 of 10 (permalink) Old Jun 4th, 01, 07:15 PM Thread Starter
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wow.thanx for the reply.i do understand now...so i will be looking for a M20...sure happy with all the "FAST" response.you guys are great...good night,david

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post #6 of 10 (permalink) Old Jun 5th, 01, 03:20 AM
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The M21 and M22 are close ratio transmissions so the gearing is closer together and will result in less rpm drop between shifts. If you're gonna race the car, then the M21 or M22 is the ticket, but for driving the M20 is better.

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post #7 of 10 (permalink) Old Jun 5th, 01, 12:41 PM
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1 correction, Jeff.
M21/M22 only has less rpm drop between 3-4. The percentage drops on the other 2 shifts are the same as a M20.

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post #8 of 10 (permalink) Old Jun 5th, 01, 05:48 PM Thread Starter
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well, i just found the code # on the rear end and it isn't a 3.31..... but it is a BP code....=2.73...darn...
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post #9 of 10 (permalink) Old Jun 6th, 01, 07:47 AM
 
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cant find a m20, stuff m20 input shaft,gears,and counter shaft into your m21 case, I just did my 67 pace car, got every thing i needed from national drive train.
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post #10 of 10 (permalink) Old Jun 6th, 01, 07:17 PM Thread Starter
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great response guyz.....but my wife just aproved 20 grand more for a "4-speed car"..so i just sold my sport coupe tonight and am looking for a-- s.s. or z28...with a 4 speed..thanx again,david

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