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01-21-2020, 07:14 AM
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#1 |
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Active Member
 Join Date: Oct 2002
Location: Ft. Myers, Fl
Posts: 1,711
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4 speed transmission help
I recently acquired another truck, this one is a 1968, C/20 Custom Camper, 327, 4 speed.
Reverse doesn't work, does anyone have any idea what the likely problem could be ? Also where can I buy a rebuild kit for an original 68, 4 speed? |
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01-21-2020, 08:17 AM
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#2 |
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Registered User
Join Date: Feb 2019
Location: Nor Cal
Posts: 822
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Re: 4 speed transmission help
What transmission do you have?
__________________
1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA |
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01-21-2020, 11:49 AM
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#3 |
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Active Member
Join Date: Oct 2002
Location: Ft. Myers, Fl
Posts: 1,711
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Re: 4 speed transmission help
I don't know how to tell what 4-speed I have, can you tell me an easy way to find out?
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01-21-2020, 12:01 PM
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#4 |
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Registered User
Join Date: Jul 2002
Location: St. James, MO
Posts: 1,239
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Re: 4 speed transmission help
What is the shift pattern?
__________________
'69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt. |
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01-21-2020, 12:05 PM
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#5 |
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Senior Member
Join Date: Nov 2018
Location: Waterford California
Posts: 2,365
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Re: 4 speed transmission help
Should be a SM 465
https://upload.wikimedia.org/wikiped...ransmition.jpg It's predecessor was the SM 420 http://www.novak-adapt.com/images/pi...21_adapter.jpg |
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01-21-2020, 12:06 PM
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#6 |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,107
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Re: 4 speed transmission help
www.torqueking4x4.com
has parts for manual transmissions you could have a SM420...NP435...or SM465 in that year https://torqueking.com/category/1967...transmissions/
__________________
1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer ............. 
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01-21-2020, 12:22 PM
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#7 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,388
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Re: 4 speed transmission help
PTO cover on drivers side only---420
PTO cover on both sides---465 PTO cover on pass side only---435...........the 435 also has an aluminum top shifter tower |
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01-21-2020, 03:18 PM
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#8 |
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Registered User
Join Date: Oct 2006
Location: Orland Park Il
Posts: 2,041
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Re: 4 speed transmission help
If you have a 435 would you please tell me which frame holes the frame stands are in and post a pic of your high hump transmission cover?
__________________
68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback |
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01-21-2020, 04:14 PM
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#9 | |
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Registered User
Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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Re: 4 speed transmission help
Quote:
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1968 GMC C2500 Long Bed Fleetside |
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01-21-2020, 04:21 PM
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#10 | |
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Registered User
Join Date: Oct 2006
Location: Orland Park Il
Posts: 2,041
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Re: 4 speed transmission help
Quote:
__________________
68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback |
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01-21-2020, 07:06 PM
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#11 |
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Active Member
Join Date: Oct 2002
Location: Ft. Myers, Fl
Posts: 1,711
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Re: 4 speed transmission help
Here's a picture of the shift pattern along with the shifters position on the high hump.
Also it does have an inspection cover on both driver and passenger side, passenger side shown in picture. |
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01-21-2020, 07:26 PM
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#12 |
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Registered User
Join Date: Oct 2006
Location: Orland Park Il
Posts: 2,041
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Re: 4 speed transmission help
I’d say it’s a 465. The date code is what you cleaned off 3/19/6x the GM number is below it
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68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback |
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01-21-2020, 08:35 PM
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#13 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,709
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Re: 4 speed transmission help
I agree, SM465. The NP would not say GM on it. The NP435 and SM465 have same shift pattern with reverse down and to the right. The SM420 has reverse down and to the LEFT.
__________________
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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01-21-2020, 09:39 PM
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#14 |
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Active Member
Join Date: Oct 2002
Location: Ft. Myers, Fl
Posts: 1,711
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Re: 4 speed transmission help
Okay thanks guys that date code the last digit is "8 " it's a 68
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01-21-2020, 09:51 PM
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#15 | |
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Registered User
Join Date: Oct 2006
Location: Orland Park Il
Posts: 2,041
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Re: 4 speed transmission help
Quote:
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68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback |
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01-22-2020, 12:36 PM
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#16 | |
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Registered User
Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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Re: 4 speed transmission help
Quote:
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1968 GMC C2500 Long Bed Fleetside |
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