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12-21-2014, 01:34 PM
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#1 |
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How did I get this OLD!
 
Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
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truck 4 speed question. Does M20 mean M20?
I have purchased a 68 Fleetside. I'm confused at the M20 on the SPID. Does it mean Muncie wide ratio or is it a granny gear?
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12-21-2014, 01:43 PM
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#2 |
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Registered User
Join Date: Jul 2014
Location: Edmonton Alberta
Posts: 13
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Re: truck 4 speed question. Does M20 mean M20?
It is the granny low muncie sm465. The spid on mine also says m20. That's just the way chevy did it I guess. The m20, m21 and the m22 muncies never came in our trucks.
__________________
72 Custom/10 LWB Stepside "Ol Medium Bronze" Frame off resto in progess  the one that started it all72 GMC C2500 “Olive” Parts/toy hauler for my fleet of dilapidated muscle cars -Nick |
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12-21-2014, 02:21 PM
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#3 |
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How did I get this OLD!
Join Date: Dec 2014
Location: Lamont County, AB, CANADA
Posts: 1,047
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Re: truck 4 speed question. Does M20 mean M20?
Ah 72c10_longstep, another fellow Canuck. Founded the truck in Lamont County. Oshawa truck 307, 4speed, Black with red guts, untouched. Radio delete, hub caps. A "Man" truck, manual steering, manual brakes, manual windows, manual transmission.
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12-21-2014, 03:10 PM
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#4 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: truck 4 speed question. Does M20 mean M20?
As you have discovered, RPO codes get reused across different model years and different vehicle platforms.
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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12-21-2014, 08:11 PM
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#5 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,727
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Re: truck 4 speed question. Does M20 mean M20?
M20 means wide ratio 4 speed. Same thing it meant in the cars. Only difference is it refers to what was available in the platform.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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12-22-2014, 08:56 AM
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#6 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: truck 4 speed question. Does M20 mean M20?
M20 is the RPO code, not the transmission model #, just like an automatic is a TH350 or TH400, not an M49
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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