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ok gents what transmission is in this 1962 C40
#717150 Tue Feb 01 2011 06:50 AM
Joined: Jan 2011
Posts: 23
J
New Guy
its a manual 4 spd it has the basic 1-4 in a H pattern but when you go into neutral and slide it left and down it is reverse.

what transmission do i have??

thanks Jake.

Re: ok gents what transmission is in this 1962 C40
jakewells #717151 Tue Feb 01 2011 06:58 AM
Joined: Jan 2008
Posts: 4,661
C
Shop Shark
It would be GM's own SM420 4 speed. Its a very reliable transmission that was used for almost 20 years.

Re: ok gents what transmission is in this 1962 C40
crenwelge #717155 Tue Feb 01 2011 07:18 AM
Joined: Jan 2011
Posts: 23
J
New Guy
thanks crenwelge for the info. i know first gear is something very low since i got 8 mpg out of first and i got to 16 in second gear

Re: ok gents what transmission is in this 1962 C40
jakewells #717493 Wed Feb 02 2011 12:59 PM
Joined: Apr 2005
Posts: 930
S
Shop Shark
My '54 GMC 2 ton,in low in both boxes and the axle,is good for 1/2 mph at redline. ;)But,yeah-you have the SM420;I like that box a LOT better than the 435 or 465,but around here you have to fight the off-roaders for 'em.
Speed


1954 GMC 350
1957 GMC 1/2 ton
1962 Chevy C-30
1952 Chevy 6400 dump bed project truck
'98 Harley FLSTC
'66 Pontiac Catalina
'76 Chevy 1 ton Duallie
'84 Bronco II
'78 Dodge W-200
'81 Toyota 4X4 truck
Re: ok gents what transmission is in this 1962 C40
jakewells #1365544 Fri Jun 19 2020 12:18 PM
Joined: Feb 2012
Posts: 34
S
Wrench Fetcher
Sm420 has the lowest 1st gear ratio of all the medium duty 4 speeds, 7.05-1. Had one in a Jeep!

Re: ok gents what transmission is in this 1962 C40
jakewells #1365546 Fri Jun 19 2020 12:34 PM
Joined: Apr 2005
Posts: 8,788
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
You must be bored this morning. nanner


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
ā€˜65 Chevy Biscayne 4dr 230 I-6 one owner (Iā€™m #2)
ā€˜39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: ok gents what transmission is in this 1962 C40
jakewells #1365677 Sat Jun 20 2020 03:56 AM
Joined: Jul 2004
Posts: 3,551
R
Shop Shark
So must you!


Rich

'47 Loadmaster

Life is like a roll of toilet paper--the closer you get to the end, the faster it goes!







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