Take a look here for detailed discussion on identification, parts &
conversions (to jeeps & other applications).
http://www.novak-adapt.com/knowledge/sm420.htm
Regards,
Doug Pewterbaugh
dpewter@msn.com
Denton, TX
49 3104 216 5-window
----- Original Message -----
From: "stephen johnston" <stephenzone@hotmail.com>
To: <oletrucks@autox.team.net>
Sent: Sunday, February 16, 2003 7:35 PM
Subject: [oletrucks] sm420 history/data/discussion needed
> sm 420 is a muncie and were in light duty gm trucks from 47 to 67.
> 10.43 in length
> 7.05 1st, non-synchronized
> 3.57 - 2nd
> 1.70 - third
> 1 - forth
> 4.686 retainer
> i looked for a 420 for my jeep cause of the length but i ended up using a
> sm465 which replaced the 420 but is 12.00 in length and has a low of 6.54
> after the jeeps drivetrain was done i did find a couple of 420's one was
in
> a 2 ton 47 chev. another that i kept, came out of a 64 gmc 1 ton (canadian
> version used chev drivetrains)and had the hand brake on the ass end.
>
> steve 55TF gmc w/ 283
> 78 CJ7 (levi special)- 70 LT1 350/sm465/205 transfer case/dana 44 rear w
> lockers
>
> varanus@phoenix.net
> Reply-To: varanus@phoenix.net
> To: oletrucks@autox.team.net
> Subject: [oletrucks] sm420 history/data/discussion needed
> Date: Sun, 16 Feb 2003 11:48:06 -0600
>
> I am tired of being in the dark on these sm420 trannies used in our
> (47-54?) 55-59 (and up to 67?) gm trucks.
> as with everything in my life, i want to know everything there is to
> know about them. such as:
>
> 1.) EXACTLY what years were they used?
> 2.)How many configurations are there? (i've noticed what I think
> were slight differences on housing castings - different ridges on top
> plate or whatnot). Also, a list member says he has sm420s with
> handbrakes. EXACTLY what trucks were they offered in and was
> there a difference between a 1.5 ton 420 and a 1/2ton 420?
> 3.)I know the 420 to be a Muncie. What exactly does this mean?
> Muncie manufactured this tranny for GM? Is that what the M in
> sM420 means. If so, what does the S mean? What is the Muncie
> part number for this trans?
> 4.)the 420 seems to be popular with offroad applications. i think the
> ratio was 7.05:1. Is this correct?
> 5.)Where can I get parts list and detailed diagrams on this trans?
> 6.)my local trans shop quoted me $700-$800 to rebuild my 57 420.
> I spoke with 2 obsolete trans parts suppliers and the parts I needed
> came out to about the same as the trans shop quote. have ya'll
> had similar prices quoted to rebuild your 420 4 speeds?
>
> I think that about takes care of my immediate questions - lol.
> I'd appreciate any and all data anyone can provide on this trans.
> Thanks a lot ya'll.
> Charles
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
>
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> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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