Cruise control speedometer cables for 1976 GMC - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nm78bronco · 01-19-2017, 01:02 PM

I have a 1976 GMC C-15 suburban (454 engine) with cruise control. I am trying to find the speedometer cables. My questions are:

1) are there only two speedometer cables required? One would be from the speedometer to the transducer and the second would be from the transducer to the TH400 transmission.

2) what are the delco speedometer cable part numbers for this application?

Thanks to anyone who can help.

GRADYS Performance · 01-19-2017, 06:11 PM

There is also a cable from the transducer to the speedometer in the dash.

Dead Parrot · 01-19-2017, 06:44 PM

I think there are 3. A short one from the transmission to space. A longer one from the space end of the short one to the cruise unit(or speedometer if no cruise). And the final one from the cruise unit to the speedometer.

Guessing the short cable varied by transmission but allowed GM to have one length cable from the short one to the speedometer or Cruise.

**hatzie** · 01-20-2017, 09:54 AM

There are usually two cables and maybe a gear reduction adapter that's mounted directly to the transmission output.
Lower cable from the Transmission to Transducer
Upper cable from the Transducer to Speedometer

Any speedometer shop will either stock your cables or can make em for you.

nm78bronco · 01-22-2017, 03:02 AM

I'll have the speedometer cables made. Thanks for everyone's input!

01-19-2017, 01:02 PM	#1
nm78bronco Registered User Join Date: Apr 2011 Location: San Tan Valley, Arizona Posts: 30	Cruise control speedometer cables for 1976 GMC I have a 1976 GMC C-15 suburban (454 engine) with cruise control. I am trying to find the speedometer cables. My questions are: 1) are there only two speedometer cables required? One would be from the speedometer to the transducer and the second would be from the transducer to the TH400 transmission. 2) what are the delco speedometer cable part numbers for this application? Thanks to anyone who can help.

01-19-2017, 06:11 PM	#2
GRADYS Performance Registered User Join Date: Dec 2013 Location: Columbus, Oh Posts: 367	Re: Cruise control speedometer cables for 1976 GMC There is also a cable from the transducer to the speedometer in the dash.

01-19-2017, 06:44 PM	#3
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,612	Re: Cruise control speedometer cables for 1976 GMC I think there are 3. A short one from the transmission to space. A longer one from the space end of the short one to the cruise unit(or speedometer if no cruise). And the final one from the cruise unit to the speedometer. Guessing the short cable varied by transmission but allowed GM to have one length cable from the short one to the speedometer or Cruise.

01-20-2017, 09:54 AM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Cruise control speedometer cables for 1976 GMC There are usually two cables and maybe a gear reduction adapter that's mounted directly to the transmission output. Lower cable from the Transmission to Transducer Upper cable from the Transducer to Speedometer Any speedometer shop will either stock your cables or can make em for you. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 01-20-2017 at 10:10 AM.

01-22-2017, 03:02 AM	#5
nm78bronco Registered User Join Date: Apr 2011 Location: San Tan Valley, Arizona Posts: 30	Re: Cruise control speedometer cables for 1976 GMC I'll have the speedometer cables made. Thanks for everyone's input!



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