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06-24-2003, 12:03 AM
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#1 |
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Registered User
Join Date: Mar 2002
Location: Floodwood Minnesota
Posts: 1,057
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SM420 vs 465 ??
Whats the difference?
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1967 K30 Napco 292/SM420 original paint 30k miles 1968 K60 Napco 396/5spd. dbl frame 52" michelins 1969 K10 SWB GMC 454/4spd 6" 35's posi,hooks 1972 C30 longhorn,BB/AT,A/C,Tilt,Toolbox,lokr 1987 K20 Chevrolet Suburban. 6" lift. 5.7L/TH400 1979 K60 GMC Coleman 4x4, 427/Allison. |
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06-24-2003, 12:21 AM
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#2 |
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Registered User
Join Date: Feb 2003
Location: The Rubber City
Posts: 5,498
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the 420 has a bit lower of a first gear, and the reverse is on the driver side of the "H"...it might be a little smaller than the 465, too
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1969 GMC K2500  1996 Honda Accord 2007 Kawasaki KLR 650 |
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06-24-2003, 01:04 AM
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#3 |
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Have A Nice Day!
Join Date: May 2003
Location: California
Posts: 355
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I have been told the 465 is stronger than the 420. The 420 is supposedly shorter . Jeep guys love the 420 for the gearing and length.
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1970 CST K10 350/350/205
Short Bed - Fleetside Tach-Tilt-A/C-Tow Hooks Front & Rear Disc Brakes Front & Rear Posi 3.73 Gears 30 Gallon Stainless Fuel Tank SOLD 01/18 !!!!! 2007 2500 HD Classic Crew Cab LT2 4X4 Duramax LBZ   |
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06-24-2003, 01:16 AM
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#4 |
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I need another Barley Pop
Join Date: Feb 2001
Location: Grants Pass, OR
Posts: 1,629
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yep, the 420 is about 1 1/2" shorter than the 465. It is also lower geared in first. I don't know about the strength difference, they both seem very stout to me. The 465 is easier to get replacement parts as they quit making the 420 in 67 or early 68.
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67 Short Fleet 4x4 04 Honda CRF450R 89 Toyota 4-Runner 34 Ford 2 door sedan - Long term project ---------------------------------------------- There is a very fine line between "hobby" and "mental illness"
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06-24-2003, 01:27 AM
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#5 |
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Registered User
Join Date: Feb 2001
Location: Salem , Oregon 97301
Posts: 1,796
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Pont when you say shorter does that mean in length or height ? Will the 465 interchange i mean will it bolt up to the rockwell without any modifications ?
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06-24-2003, 08:55 AM
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#6 |
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Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,507
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To bolt a Rockwell that was behind a 420 onto a 465, you would need the Rockwell adapter that goes with the 465. This is a rare unit, since it was 1969 only, IIRC.
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Tim |
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06-24-2003, 10:38 AM
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#7 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,731
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The 420 was never married. (Actually, they MIGHT have been married 1 year, 67.)They used divorced t-case in 4x4 applications. The 465 is very strong and very common until the early 90's. www.advanceadapters has transmission dimensions in an installation guide. I believe it is free but their swap books are not. I have a couple of them and they are well worth the nominal fee of $8 or so.
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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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06-24-2003, 01:06 PM
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#8 |
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I need another Barley Pop
Join Date: Feb 2001
Location: Grants Pass, OR
Posts: 1,629
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Jose, the 420 is shorter in length and as Blazer1970 said, you would need to get the correct adapter to mount a 465 to the Rockwell. When I pulled the 420/Rockwell out of mine and installed the 465/NP205 combo, it moved my crossmember back almost 2 inches.
Mike C, my 67 had the 420 and Rockwell married so we know they at least did it in 67. I'll ask Breeh if his 68 was married or divorced.
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67 Short Fleet 4x4 04 Honda CRF450R 89 Toyota 4-Runner 34 Ford 2 door sedan - Long term project ---------------------------------------------- There is a very fine line between "hobby" and "mental illness"
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06-24-2003, 08:56 PM
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#9 |
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Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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My 69 GMC had a rockwell and 420, TC had 1967 stamped tag though.. I think Canada ended up with more of this combo in 69 in the GMC line. Brother has a 69 GMC with rockwell and 465. Both married tranny to transfer case in our cases.
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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. |
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06-25-2003, 12:06 AM
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#10 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,731
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Guess I was confused on what year the 465 showed up. Anyhow, NO trucks BEFORE 67 had married t-case and sm420. (Until proven otherwise, I'll stick with it!)
 In the US wasn't the 465 used in 68 and up?
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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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06-25-2003, 01:40 AM
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#11 |
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I need another Barley Pop
Join Date: Feb 2001
Location: Grants Pass, OR
Posts: 1,629
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I'm not much for crunching numbers but I think you are absolutely right, 68 up was the standard for the 465. I have heard of some 420's carried over to 68 but I don't think it's that common.
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67 Short Fleet 4x4 04 Honda CRF450R 89 Toyota 4-Runner 34 Ford 2 door sedan - Long term project ---------------------------------------------- There is a very fine line between "hobby" and "mental illness"
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