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#1 |
Registered User
Join Date: May 2015
Location: Wolf, CA
Posts: 18
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Bad speedo or cable?
Now that I'm driving the truck more regularly, some age issues are popping up. Occasionally heard a a noise that was behind the dash intermittently. Driving down the road today, suddenly a high pitch squeal under my feet, speedo was bouncing at the 100 mph mark( no I wasn't actually going that fast), stopped the truck, and the speedo stayed pegged past 100. Disconnected the cable at the trans first ( no change), then disconnected behind the dash (no change). Speedo is now pegged all the way to the right. So, is the speedo toast, or can I reset it somehow and replace the cable and be good to go? Thanks for any help?
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#2 |
Never Ending Projects
Join Date: Jul 2006
Location: San Diego, CA
Posts: 3,836
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Re: Bad speedo or cable?
Had something similar happen in my '65 truck. Had to replace the speedo unit as it ended up snapping the needle off. Luckily I had a spare cluster.
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. 1965 C10 Panel, ![]() 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often... |
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#3 |
Chevy addict
Join Date: May 2012
Location: Iron Ridge, WI
Posts: 1,085
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Re: Bad speedo or cable?
We do it the old fashioned way and take things apart to diagnose the problem, difficult to check it out from here.
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#4 |
Registered User
Join Date: May 2013
Location: Centerville,Ma.
Posts: 1,223
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Re: Bad speedo or cable?
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#5 |
Registered User
Join Date: Apr 2014
Location: calgary alberta
Posts: 1,248
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Re: Bad speedo or cable?
check the driven gear in the trans they pile up and do funny things
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#6 | |
Registered User
Join Date: Jun 2013
Location: joshua tree ca.
Posts: 1,484
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Re: Bad speedo or cable?
Quote:
YES TOAST .....The needle shaft has seized (Lack of lube 50...years go figure) to the main input in the speedo head it needs to be rebuilt or new mechanism |
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#7 |
Registered User
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,166
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Re: Bad speedo or cable?
I think the needle is connected to a magnetic drag cup with a spring to always pull it back to zero. It has obviously gained traction from the turning piece inside it going wonky.
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