Speedo needle bouncing
Thread Starter
Drifting
Joined: Apr 2002
Posts: 1,720
Likes: 19
From: Manhattan Beach Ca
Speedo needle bouncing
When the muffler shop installed my new system they forgot to lift the speedo cable off the pipes. It melted and seized up. So I replaced with a new one but didnt replace the gear in the tranny.
Now at highway speeds the needle sways back and forth around 4-6 mph never staying still. At lower speeds I guess it's not noticeable.
Anyone seen this before and could it be my plastic gear or something else?
Now at highway speeds the needle sways back and forth around 4-6 mph never staying still. At lower speeds I guess it's not noticeable.
Anyone seen this before and could it be my plastic gear or something else?
Melting Slicks
Joined: Apr 2008
Posts: 2,622
Likes: 242
From: Russell Ontario
St. Jude Donor '09
the cable maybe too long , or has a bad twist in it , look at it and see the routing , if you have a sharp turn it may make it jump , I find the replacement cables are junk! Ron
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
Use graphite. It's not affected by cold temperatures. It's also a dry lube so it won't gum up over time. It's powdery so take the cable out of the jacket and put the graphite on a rag, grab the rag from the bottom, wrap your hand with the rag around the cable and pull the cable through it.
If your speedometer cable can't be removed you will need to pour or inject the graphite into the end. Much tougher to tell if you got the whole thing that way.
cc
If your speedometer cable can't be removed you will need to pour or inject the graphite into the end. Much tougher to tell if you got the whole thing that way.
cc
Last edited by CCrane65; Dec 11, 2009 at 08:59 PM.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Use graphite. It's not affected by cold temperatures. It's also a dry lube so it won't gum up over time. It's powdery so take the cable out of the jacket and put the graphite on a rag, grab the rag from the bottom, wrap your hand with the rag around the cable and pull the cable through it.
If your speedometer cable can't be removed you will need to pour or inject the graphite into the end. Much tougher to tell if you got the whole thing that way.
cc
If your speedometer cable can't be removed you will need to pour or inject the graphite into the end. Much tougher to tell if you got the whole thing that way.
cc
Corvette Speedo and Tach Cable Lubrication Instructions AC Delco
http://willcoxcorvette.com/repairand...lp.php?hID=283
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Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I had that same problem on my 77. New cable didn't help. Pulled the speedo and took it to a local shop- he ran it on his test machine- same thing- the bearings for the needle were bad. $125 later and it's new.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Might also be a cable in a bind, or lack of lubricant on the cable. One quick way to find out is to remove the cable from the tranny, make sure it's not in a bind and then run the speedo up with a drill.
Willcox
