Which is better - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bad 71 chevy · 09-21-2003, 03:20 AM

A muncie m-21 or an m-20 and what is the big differance with them thanks

JimKshortstep4x4 · 09-21-2003, 06:59 AM

I am not sure if one is "better" than the other. I guess it would depend on the application. The M-20 is a wide ratio transmission
which means it has a lower ratio first gear, (I believe that it is 2:52 to 1) which will give you greater starting torque. The M-21
is a close ratio transmission and has a higher ratio first gear, 2:20 to 1. Outside of the different first gear ratios the two transmissions are very similiar.

Here is a link that has more information on the Muncies.

Jim

http://www.gearzone.net/kit.htm

09-21-2003, 03:20 AM	#1
bad 71 chevy Registered User Join Date: Jun 2000 Location: Omaha NE 68122 Posts: 637	Which is better A muncie m-21 or an m-20 and what is the big differance with them thanks __________________ 71 Chevy C/10 lwb 350 5 speed nv3500 3.73 rear end 2.5" Front Drop and 4" in the back Edelbrock perfomer rpm manifold Edelbrock 600 cfm carb Headmen headers

09-21-2003, 06:59 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I am not sure if one is "better" than the other. I guess it would depend on the application. The M-20 is a wide ratio transmission which means it has a lower ratio first gear, (I believe that it is 2:52 to 1) which will give you greater starting torque. The M-21 is a close ratio transmission and has a higher ratio first gear, 2:20 to 1. Outside of the different first gear ratios the two transmissions are very similiar. Here is a link that has more information on the Muncies. Jim http://www.gearzone.net/kit.htm



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