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03-24-2015, 11:07 PM
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#1 |
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Registered User
Join Date: Jan 2013
Location: Alberta, Canada
Posts: 132
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71 c-10
I have a 1971 C -10. Since I've owned it (almost 4 yrs) the speedometer has never worked. Well with my interior almost complete ( ya I know should have prolly fixed that first) All gauges work except speedometer. Was this issue in that particular year or? Aside from speedometer cable I wouldn't know where to start. Any ideas?
350 Th350 no A/C I appreciate all feedback Thanks zibs71 |
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03-25-2015, 07:26 AM
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#2 |
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Registered User
Join Date: Jan 2015
Location: North Carolina
Posts: 17
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Re: 71 c-10
Pull the cable out of the tranny and verify the plastic gear isn't broken. Shine a light and check the gear on the output shaft. Its a good time the change the seals too if you haven't.
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03-25-2015, 08:21 AM
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#3 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: 71 c-10
Take the cable loose at transmission and hook the cable to a battery drill and see if the speedometer will work. If so then it's something inside the transmission.
If it doesn't work then either the cable is bad are the speedometer is bad.Just bump the drill the first time to make sure the rotation is right. 
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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03-25-2015, 08:28 AM
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#4 |
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Senior Member
 
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
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Re: 71 c-10
things just wear out in 40 some years, nothing new....
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Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks 
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