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Old 11-17-2011, 10:36 AM   #1
63CHEVY62GMC
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how do i know what transmission i have?

the truck is a 1963 Chevy c-20 3/4 truck. it has the 4 speed with granny first gear. i was wondering who mad the transmission, Muncie, Saginaw, etc. thanks
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Old 11-17-2011, 10:58 AM   #2
markeb01
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Re: how do i know what transmission i have?

It is most likely a Muncie SM420.

Here’s a link that's full of information regarding this transmission:

http://www.novak-adapt.com/knowledge/sm420.htm
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Old 11-17-2011, 12:06 PM   #3
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Re: how do i know what transmission i have?

I agree with what Markeb01 said, only real way to know is to find the casting numbers and run them
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Old 11-17-2011, 01:13 PM   #4
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Re: how do i know what transmission i have?

Yes more than likely it is the muncie sm420, assuming your truck is a 2x4, if it is a 4x4 its more than likely the sm465...bascilly the 4x4 version of sm420
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Old 11-17-2011, 01:17 PM   #5
63CHEVY62GMC
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Re: how do i know what transmission i have?

thanks for all of the info. ive always wondered what transmission i had. aint thought about running the casting numbers, ill try that.
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Old 11-17-2011, 01:20 PM   #6
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Re: how do i know what transmission i have?

Quote:
Originally Posted by markeb01 View Post
It is most likely a Muncie SM420.

Here’s a link that's full of information regarding this transmission:

http://www.novak-adapt.com/knowledge/sm420.htm

THAT IS AWESOME!!!! i did not know it had a PTO port.
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Old 11-17-2011, 05:13 PM   #7
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Re: how do i know what transmission i have?

took mine to a local shop to have mine identified. he thought it was either a muncie or new process. turns out its a borg warner t18.
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Old 11-18-2011, 01:18 AM   #8
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Re: how do i know what transmission i have?

The SM465 didn't come out until the '68 model year. All light and medium duty GM truck 4 speeds prior to that were the SM420 in both the 2wd and 4wd.

Quote:
Originally Posted by blue64c20 View Post
Yes more than likely it is the muncie sm420, assuming your truck is a 2x4, if it is a 4x4 its more than likely the sm465...bascilly the 4x4 version of sm420
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Old 11-18-2011, 03:29 PM   #9
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Talking Re: how do i know what transmission i have?





http://www.yearone.com/updatedsingle...nfo/muncie.asp

http://www.5speeds.com/muncie.htm
http://www.5speeds.com/muncie2.htm
http://www.5speeds.com/muncie3.htm
New Muncie 4 Speed Transmissions
http://www.5speeds.com/newm22.html

((((Transmission Specs ))))
http://67-72chevytrucks.com/vboard/s...d.php?t=390542

Online engine resources (casting numbers, calculators, etc.)
http://67-72chevytrucks.com/vboard/s...d.php?t=382583

1960-1966 Chevy/GMC Pickup Truck Specs & Engine/Trans/Axle ID's
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Last edited by 1Bad62Pro/Street; 11-18-2011 at 03:35 PM.
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Old 11-18-2011, 08:09 PM   #10
63CHEVY62GMC
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Re: how do i know what transmission i have?

Quote:
Originally Posted by 1Bad62Pro/Street View Post
thanks! never seen any charts like that. figured out that it has the muncie sm-420.
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