C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Speedometer needle bouncing

Thread Tools
 
Search this Thread
 
Old Aug 13, 2017 | 09:24 PM
  #1  
Bigdade's Avatar
Bigdade
Thread Starter
Heel & Toe
 
Joined: Jul 2017
Posts: 23
Likes: 0
Default Speedometer needle bouncing

My 1980 c3 speedo is making a clicking noise and bouncing.Its also about 10 mph too fast.Trip and odometer are working.Any ideas?
Reply
Old Aug 13, 2017 | 09:32 PM
  #2  
terry82's Avatar
terry82
Le Mans Master
25 Year Member
 
Joined: Jul 2000
Posts: 6,663
Likes: 162
From: columbia city in
Default

lube speedo cable.
Reply
Old Aug 14, 2017 | 07:13 PM
  #3  
tehjrow's Avatar
tehjrow
Instructor
 
Joined: Jul 2017
Posts: 217
Likes: 21
Default

I pulled the inner cable all the way out, used dry graphite lube, and slid it all the way back in.
Reply
Old Aug 14, 2017 | 08:38 PM
  #4  
M Pete's Avatar
M Pete
Instructor
10 Year Member
 
Joined: Nov 2011
Posts: 212
Likes: 18
From: Bucks County, PA
Default

Or pay about $10 for a new one, install is pretty easy. Is the clicking coming from under the car? If so I'd recommend getting a new cable because that is the cable slipping in the plastic gear in the transmission which I would imagine eventually ruin that as well.

Mine was clicking after my original cable broke and it turns out that my cruise control is locking up so I just ran the cable straight from trans to speedo.
Reply
Old Aug 14, 2017 | 09:40 PM
  #5  
Victor's Avatar
Victor
Melting Slicks
20 Year Member
 
Joined: Jul 2000
Posts: 2,848
Likes: 0
From: Beacon NY
Default

I believe the bouncing is an indicator that the speedo cable is on the way out. Mine did that for about a year before the speech actually stopped working. I'd just buy a new one rather than try to fix it.

I wish I would have paid attention to this when my speedo stopped working, but am I correct in assuming that the speedo cable also controls the odometer?

My '79 had the TH350 (automatic) and If I recall correctly the only connections to the transmission were the cable connecting the shifter to the trans, a vacuum hose, the speedo cable, and a kick-down cable that connected to the throttle linkage on the carberator. So the odometer would have to be driven by the speedometer cable??
Reply

Get notified of new replies

To Speedometer needle bouncing





All times are GMT -4. The time now is 03:16 AM.

story-0
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-1
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-2
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-3
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-4
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-5
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-6
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-7
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-8
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-9
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE