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#1 |
Registered User
Join Date: Jan 2014
Location: Ft Myers Florida
Posts: 571
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Speedometer stuck on 70mph
My new project 68 came without a speedometer cable. Should the speedo needle fall on zero mph when nothing is connected to it? I installed the new cable and the speedo just spins randomly around, I don't know if I damaged it by hooking it up before it was on zero or if it was already shot.
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1968 C10 |
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#2 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Speedometer stuck on 70mph
Id like to see video of that!
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#3 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,637
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Re: Speedometer stuck on 70mph
Yes. Dunno what else is wrong with it though....
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#4 |
Moderator
![]() Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,193
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Re: Speedometer stuck on 70mph
You will find oil has found its way into the speedo head mechanism,,,
the speedo head needs to be cleaned or replaced... |
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#5 |
Registered User
Join Date: Jul 2013
Location: LI, NY 11801
Posts: 1,140
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Re: Speedometer stuck on 70mph
Step on the brakes? J/K
Should drop to zero with no cable attached. I don't think you can damage it unless you hook up the cable while driving!
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1970 C10 8' Fleetside, L6 250, 3 on the Tree. The most basic of pickup trucks! |
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#6 |
Registered User
![]() Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Speedometer stuck on 70mph
If its going that fast, don't fix what aint broke!
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#7 |
Registered User
Join Date: Jan 2014
Location: Ft Myers Florida
Posts: 571
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Re: Speedometer stuck on 70mph
I solved the issues that I described but now a new one has appeared. It seems to be accurate (compared to gps speedometer) up until 25+mph. Once I reach 25mph actual speed the truck speedometer says 50mph and it just gets crazier the faster I go. I figure its shot but figured I'd see if anyone here knows for sure.
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1968 C10 |
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#8 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: Speedometer stuck on 70mph
Sounds like your problem is in the cable and not the speedometer ...
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#9 | |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Speedometer stuck on 70mph
Quote:
I have a certified speedometer calibration tester and tools to make your speedometer work like new. Let me know if interested, Tom
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Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#10 | |
Registered User
Join Date: Jan 2014
Location: Ft Myers Florida
Posts: 571
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Re: Speedometer stuck on 70mph
Quote:
Grumpy, I know that the the cable can stick if not lubed well enough and causes a jumping needle, but it can also just cause it to read faster than actual? And just in case it sounds like I'm challenging your thought, I assure you I'm not.
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1968 C10 |
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#11 | |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Speedometer stuck on 70mph
Quote:
Drive on a portion of road where you can go a measured mile, like on a freeway. Don't worry about your actual speed but drive the mile and see what the odometer does. If it matches and rolls one mile for the measured mile driven, then the trans gearing is good. If it does not and goes over or under a mile in the same driven mile, then you look at different trans gears based off tire size and rear gear ratio. If the measured mile tile passes, then your probelm is speedometer calibration. Hope this helps everyone understand how it works. Thank you, Tom
__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#12 |
Registered User
Join Date: Jan 2014
Location: Ft Myers Florida
Posts: 571
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Re: Speedometer stuck on 70mph
But its within a few mph of the gps reading when under 25 and then once I go over that it jumps to being off my 25mph give or take a few. I wouldn't expect a big jump in inaccuracy if it was just related to trans gear. Sounds more like calibration to me wouldn't you agree?
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1968 C10 |
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#13 | |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: Speedometer stuck on 70mph
Quote:
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__________________
Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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