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04-30-2005, 04:59 PM
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#1 |
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Senior Member
 
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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1970 4-speed transmission question
On my option list it says the 4-speed option is M-20. Is this really M-420? Thanks
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04-30-2005, 05:28 PM
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#2 |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,507
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SM465
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Tim Last edited by Blazer1970; 04-30-2005 at 05:28 PM. |
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05-01-2005, 12:02 AM
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#3 |
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Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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They stopped using the 420 in '68 I think.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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05-01-2005, 02:08 AM
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#4 |
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Registered User
Join Date: Jan 2002
Location: cornville, maine
Posts: 659
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There was a SM420, SM 465, and a third 4 speed available in light trucks, I think, or am I wrong? Sort of like the T10?
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jku Cornville, Maine 68 C10 burb 42 Willys MB 46 Dodge WF-32 1.5 ton 53 & 56 Olds' 60 Cadillac 22 Dodge Brothers |
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05-01-2005, 02:57 AM
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#5 |
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Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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the SM420 was used up to and including '67
SM465 is '68 on up. the NP435 (wide & close ratio) were optional for some pre '72 trucks.
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1969 GMC K2500  1996 Honda Accord 2007 Kawasaki KLR 650 |
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05-01-2005, 04:14 AM
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#6 |
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Got Light Emitting Diode?
Join Date: Apr 2004
Location: Newberg, OR
Posts: 2,485
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 my 68 HAD a sm465. if you crawl under and look at the tranny, there will be what looks like access plates. if its a sm 420 it will only have one (not sure what side) and if it is a 465 it will have one on each side. these are for PTOs
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's  (the family car)1993 Cherokee work ride/weekend wheeler |
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11-21-2005, 12:57 AM
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#7 |
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Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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Re: 1970 4-speed transmission question
Seen the 420 in 69 gmc 4x4s too.
the other 4spds are a sm435 and sm465 the 420 has pto port of drivers side only
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Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. Last edited by Rod; 11-21-2005 at 12:57 AM. |
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11-21-2005, 02:28 AM
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#8 |
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Registered User
Join Date: Aug 2005
Location: pleasanton, CA
Posts: 570
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Re: 1970 4-speed transmission question
1969 GMC, is the which NP435 is the wide ratio? and which is the close?
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-Steve |
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