Original 5 speed transmission?????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Huck · 01-04-2007, 09:54 AM

Looked at a 64-5 farm truck yesterday--looked to be a 2 ton. It has a factory 5 speed in it. Owner is considering parting out the truck but didn't know if the transmission's 5th gear is an overdrive or a 1-1 gear. Anyone know something about older 5 speeds and would it be a direct swap in for a 4 speed truck trans in a 72 4x4??

b454rat · 01-04-2007, 07:07 PM

There are only a few 5 speeds that have the 5th as an OD. I cant remember what they are now. I was looking for one, couldn't find one so I gave up. Didn't really have a use for it anyways, but wanted one. I don't think they are a direct swap, there is an adaptor plate that bolts between the engine and bell, the clutch is huge, the reason for the bigger bell. Here is a link to some 5 speeds.

http://members.cox.net/jeepinrandy/r.../transinfo.htm

qksilver · 01-04-2007, 09:33 PM

most if not all are direct not overdrive. The over drive part came in when the truck had a 2 speed rear
Again most had the emergency brake mounted to the trans yoke. Back in the day, 30 years ago my boss used one in his 72 swb 4x4

BobS · 01-04-2007, 10:18 PM

What is the shift pattern? Do you have any pics? I can find out what it is if it's a GMC and you know what model it is. I do know though that if it's a 64-65 GMC it's not an overdrive 5th unless it's been changed. Not so sure about Chevys.

Bob

rwgregory · 01-04-2007, 11:24 PM

Most big truck 5-speeds from that era had an ultra-low 1st gear,(6:50 to 7:25 ratio). 2nd gear was in the neighborhood of 3:50 to 4:00. 3rd gear was around 2:25. 4th gear was around 1:50, and 5th was 1 to 1. The only way I see those trannys working in a pickup is if you are running 44" mudders and want to use 5th as a "poor man's overdrive".

BIGCHEVYMAN · 01-16-2007, 06:50 PM

Clark made a 5 speed that is overdrive and it can be found in 1 ton and medium duty trucks but i can't rember what years they can be found it.

19GMC63 · 01-17-2007, 12:09 AM

here's a little info on them.
http://6066gmcguy.org/SM420.htm

01-04-2007, 09:54 AM	#1
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,261	Original 5 speed transmission?????? Looked at a 64-5 farm truck yesterday--looked to be a 2 ton. It has a factory 5 speed in it. Owner is considering parting out the truck but didn't know if the transmission's 5th gear is an overdrive or a 1-1 gear. Anyone know something about older 5 speeds and would it be a direct swap in for a 4 speed truck trans in a 72 4x4??

01-04-2007, 07:07 PM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: Original 5 speed transmission?????? There are only a few 5 speeds that have the 5th as an OD. I cant remember what they are now. I was looking for one, couldn't find one so I gave up. Didn't really have a use for it anyways, but wanted one. I don't think they are a direct swap, there is an adaptor plate that bolts between the engine and bell, the clutch is huge, the reason for the bigger bell. Here is a link to some 5 speeds. http://members.cox.net/jeepinrandy/r.../transinfo.htm __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

01-04-2007, 09:33 PM	#3
qksilver Senior Member Join Date: Dec 2004 Location: Southern Pines NC Posts: 3,853	Re: Original 5 speed transmission?????? most if not all are direct not overdrive. The over drive part came in when the truck had a 2 speed rear Again most had the emergency brake mounted to the trans yoke. Back in the day, 30 years ago my boss used one in his 72 swb 4x4 Last edited by qksilver; 01-04-2007 at 09:42 PM.

01-04-2007, 10:18 PM	#4
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	Re: Original 5 speed transmission?????? What is the shift pattern? Do you have any pics? I can find out what it is if it's a GMC and you know what model it is. I do know though that if it's a 64-65 GMC it's not an overdrive 5th unless it's been changed. Not so sure about Chevys. Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel Last edited by BobS; 01-04-2007 at 10:19 PM.

01-04-2007, 11:24 PM	#5
rwgregory Registered User Join Date: Apr 2005 Location: Chula Vista, California Posts: 495	Re: Original 5 speed transmission?????? Most big truck 5-speeds from that era had an ultra-low 1st gear,(6:50 to 7:25 ratio). 2nd gear was in the neighborhood of 3:50 to 4:00. 3rd gear was around 2:25. 4th gear was around 1:50, and 5th was 1 to 1. The only way I see those trannys working in a pickup is if you are running 44" mudders and want to use 5th as a "poor man's overdrive". __________________ rwgregory 67 GMC 2500 ,2w/d wide box 305 V-6, 4-speed

01-16-2007, 06:50 PM	#6
BIGCHEVYMAN Senior Member Join Date: Apr 2002 Location: Portland , Tennessee , United States Posts: 1,024	Re: Original 5 speed transmission?????? Clark made a 5 speed that is overdrive and it can be found in 1 ton and medium duty trucks but i can't rember what years they can be found it.

01-17-2007, 12:09 AM	#7
19GMC63 Registered User Join Date: Nov 2006 Location: Nashville, TN Posts: 1,510	Re: Original 5 speed transmission?????? here's a little info on them. http://6066gmcguy.org/SM420.htm



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