Heavy duty 4spd

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Jul 5, 2018 | 07:48 PM

rugerm44

Thread Starter

Burning Brakes

Joined: Aug 2005

Posts: 801

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Heavy duty 4spd

Have a 71 base 350 with an original 26 spline 4spd.Thought they mostly came behind big block.Numbers match vin.Is this unusual.

Jul 5, 2018 | 08:01 PM

redvetracr

Race Director

Joined: Aug 1999

Posts: 18,126

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From: WI

Quote:

Originally Posted by rugerm44

Have a 71 base 350 with an original 26 spline 4spd.Thought they mostly came behind big block.Numbers match vin.Is this unusual.

what makes it "heavy duty"?

Jul 5, 2018 | 08:10 PM

Iceaxe

Safety Car

Joined: Sep 2013

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From: Draper Utah

Base engine 71 was only available with the M20 wide ratio 4 speed and M40 automatic.

Last edited by Iceaxe; Jul 5, 2018 at 08:11 PM.

Jul 5, 2018 | 08:10 PM

Nowhere Man

Team Owner

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From: Sitting in his Nowhere land Hanover Pa

2024 C2 of the Year Finalist - Unmodified

2015 C2 of Year Finalist

unless you pulled the side cover and you see straight cut gears you have a standard M20

Jul 5, 2018 | 10:16 PM

rugerm44

Thread Starter

Burning Brakes

Joined: Aug 2005

Posts: 801

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Talked to spec clutches. They seem to think 26 was heavy duty. I thought m22 had 10 spline as,well as straight cut gears.Makes me wonder if they know much about them.Said I needed same clutch as big block

Jul 5, 2018 | 10:23 PM

rugerm44

Thread Starter

Burning Brakes

Joined: Aug 2005

Posts: 801

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Good grief. Then a standard 26 spline disc 11 inch clutch should work providing the sell me right throw out bearing. Already pulled two ram muscle car clutches due to defect

Jul 5, 2018 | 10:26 PM

Hammerhead Fred

Melting Slicks

Joined: Mar 2005

Posts: 2,094

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From: Midlothian VA

Quote:

Originally Posted by rugerm44

All 1971 Muncie 4-speeds (M20, M21, M22) had 26 input splines - so tells you nothing.
Number of grooves on the input shaft though may tell you what you have if it's unmolested.
M20 = 2, M21 = 1, M22 = none

Jul 7, 2018 | 09:22 AM

stingr69

Le Mans Master

Joined: Mar 2004

Posts: 7,493

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From: Little Rock AR

1970 and up Muncie uses 26 spline input shaft on everything (M20, M21, M22) including base models. The tailshaft housing has only 3 shifter mounting holes so they are easy to identify.

Last edited by stingr69; Jul 7, 2018 at 09:25 AM.

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Jul 7, 2018 | 11:16 AM

DrainSurgeon77

Racer

Joined: Oct 2001

Posts: 309

Likes: 12

From: Pleasant Prairie WI

In 1970 only 454 Chevelles got M-22's with 26 spline input/32 spline output...
All other M-20, M-21, and M-22's used 10 spline input/27 spline output...
In 1971 and later all Muncie's used 26 spline input/32 spline output...

Hope this helps... Eric

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