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02-12-2003, 07:58 PM
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#1 |
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Registered User
Join Date: Feb 2001
Location: Savannah, MO.
Posts: 513
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4 Speed ?
I'm learning more about the difference in transfer cases....now for transmissions.....How do I tell what type of 4 speed is in my truck? Is there a way to just look at it and know?
FYI= My truck is a 71 1/2 ton 4 speed with factory Lock outs and a 350. |
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02-12-2003, 08:24 PM
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#2 |
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I need another Barley Pop
Join Date: Feb 2001
Location: Grants Pass, OR
Posts: 1,629
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To the best of my knowledge, the only 4 spd they used in a 71 1/2ton was the GM/Muncie SM465.
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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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02-12-2003, 08:25 PM
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#3 |
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Registered User
Join Date: Aug 2001
Location: anaheim, ca
Posts: 187
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GENERALLY speaking, GM 4 speed models used were the SM420 up till 1967, with the SM465 taking over in 1968. The SM420 was never used mated to a 205 transfer case, while the SM465 was always married to a 205 case. There was only one year the 420 was married to a transfer case, 1967 when it was mated to a Rockwell T-221 case. This is info I have compiled, please, if someone else has any conflicting hard facts regarding my info, please post.
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ken '58 Chev NAPCO 4x4 short '60 GMC Suburban 4x4, restored '60 GMC 3/4T stepside 4x4 '64 GMC Suburban 4x4, restored '90 Chev Suburban 4x4, dually, ZZ502 '77 GMC Suburban 4x4, one ton axles, 12" lift, 39.5"s '88 Chevy crewcab dually 4x4, 10" lift, 42"s (x6!) '03 Jeep Wrangler Rubicon '79 Chev 3/4 Suburban 4x4, 400-400-203 |
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02-12-2003, 11:21 PM
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#4 |
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Registered User
Join Date: Jun 2001
Location: Houston, TX
Posts: 126
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Yup, should be a 10 spline SM465 as stated.
Cast iron and lasts forever. -- Mike
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http://home.houston.rr.com/chevy73/ |
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02-12-2003, 11:54 PM
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#5 |
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Registered User
Join Date: Feb 2001
Location: Savannah, MO.
Posts: 513
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Sounds good...so I've got a SM465 4 speed and Np-205 T case....nice to finally know so I can either swap or rebuild, whenever I make up my mind!
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02-13-2003, 01:04 AM
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#6 |
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Recovering 67-72 Addict
 
Join Date: Oct 2000
Location: North Bend, WA
Posts: 1,788
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NAPCO ken,
Interesting data, I have an SM465 married to a Rockwell T-221 that came out of a '68. That is the only contradiction that I can add.
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68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women" |
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02-13-2003, 02:17 AM
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#7 |
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Senior Member
Join Date: Feb 2003
Location: WIS
Posts: 1,752
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I have an M465 mated to a Rockwell in a 69 K20. It might be an early 69 where they were trying to get rid of leftovers. I want to convert it to an NP205 to get the lever to the right of the shifter. Zoomy/Pappy
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02-13-2003, 11:59 AM
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#8 |
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Registered User
Join Date: Aug 2001
Location: anaheim, ca
Posts: 187
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Interesting about the 465 to Rockwell 221 case...I wasn't sure just when the break in transfer cases was!! Thanks for the update for my records!!
__________________
ken '58 Chev NAPCO 4x4 short '60 GMC Suburban 4x4, restored '60 GMC 3/4T stepside 4x4 '64 GMC Suburban 4x4, restored '90 Chev Suburban 4x4, dually, ZZ502 '77 GMC Suburban 4x4, one ton axles, 12" lift, 39.5"s '88 Chevy crewcab dually 4x4, 10" lift, 42"s (x6!) '03 Jeep Wrangler Rubicon '79 Chev 3/4 Suburban 4x4, 400-400-203 |
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02-19-2003, 11:32 PM
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#9 |
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Registered User
Join Date: Apr 2000
Location: Oneonta, NY, US
Posts: 103
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early '69
My '69 GMC has a SM465 mated to a Rockwell T221.
It also has a closed knuckle Dana 44. Originally had a 305 V-6 also.
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Jeff '69 GMC K2500 LWB, '74 350/SM465/Rockwell T-221, cnD44/ffD60, 3.73 gears, 31" BFG's (originally had 305ci V-6) '05 VW golf '84 HD Sportster XLX '68 GMC K2500 parts beast |
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