speedometer not working
Thread Starter
Instructor
Joined: Mar 2015
Posts: 203
Likes: 4
From: Dallas Area Texas
speedometer not working
I have a 74 4 speed... and speedometer doesn't work...
How often does the cable break/go out? What else could go out that would keep it from reading the speed?
I was watching a video and it looks like there are 2 cables??? one from the speedometer that goes to about the firewall (short) and a long one (27 inches?)... can these come unclipped?
anyways I'm wanting to get the parts before the car goes to the shop and get this fixed... any other ideas on what could be wrong? (I know there are like a million things that *could* be wrong)... just looking for the 80/90 percent chance.
Thanks in advance - Jeffrey
How often does the cable break/go out? What else could go out that would keep it from reading the speed?
I was watching a video and it looks like there are 2 cables??? one from the speedometer that goes to about the firewall (short) and a long one (27 inches?)... can these come unclipped?
anyways I'm wanting to get the parts before the car goes to the shop and get this fixed... any other ideas on what could be wrong? (I know there are like a million things that *could* be wrong)... just looking for the 80/90 percent chance.
Thanks in advance - Jeffrey
Pro
Joined: Oct 2010
Posts: 695
Likes: 55
From: Palm Desert California
Hey Jeff; going through this same thing on my '73 4speed. Good chance it's the cable especially if its been in there a long time. I disconnected mine at the speedo this evening, fairly simple, just need to get the car up and disconnect from the tranny tomorrow. My cable is pretty ragged so I'm hoping that is the fix (cheap) . Other things that could be wrong , the speedo it self could be bad. Not sure what could go wrong on the tranny side those gears are pretty sturdy, hopefully some other forum member will chime in with more advice.
Good luck
Your -74 should be like my '73 and have one long cable about 72 inches long it goes through a grommet in the fire wall.
Good luck
Your -74 should be like my '73 and have one long cable about 72 inches long it goes through a grommet in the fire wall.
Last edited by tpfarm; May 27, 2015 at 01:07 AM. Reason: more info
Melting Slicks
Joined: Nov 2000
Posts: 2,507
Likes: 114
From: St. Louis Mo
I have a 74 4 speed... and speedometer doesn't work...
How often does the cable break/go out? What else could go out that would keep it from reading the speed?
I was watching a video and it looks like there are 2 cables??? one from the speedometer that goes to about the firewall (short) and a long one (27 inches?)... can these come unclipped?
anyways I'm wanting to get the parts before the car goes to the shop and get this fixed... any other ideas on what could be wrong? (I know there are like a million things that *could* be wrong)... just looking for the 80/90 percent chance.
Thanks in advance - Jeffrey
How often does the cable break/go out? What else could go out that would keep it from reading the speed?
I was watching a video and it looks like there are 2 cables??? one from the speedometer that goes to about the firewall (short) and a long one (27 inches?)... can these come unclipped?
anyways I'm wanting to get the parts before the car goes to the shop and get this fixed... any other ideas on what could be wrong? (I know there are like a million things that *could* be wrong)... just looking for the 80/90 percent chance.
Thanks in advance - Jeffrey
Thread Starter
Instructor
Joined: Mar 2015
Posts: 203
Likes: 4
From: Dallas Area Texas
Thanks for the responses...
Any idea what's the name of this gear? I want to do a google search/learn about it.
I've ordered an Assembly Instruction Manual - but don't have it yet.
- Jeffrey
I've ordered an Assembly Instruction Manual - but don't have it yet.
- Jeffrey
Burning Brakes
Joined: Jun 2011
Posts: 816
Likes: 11
From: lewisburg wv
Instructor
Joined: Sep 2010
Posts: 236
Likes: 0
I have a '78 that the speedometer wasn't working in. The cable tested OK in my case. I had to take it in to get rebuilt because I wasn't confident in my skill to manage the small parts. The main clue for me was that the trip odometer wouldn't reset. All is good now. Good luck with yours.
Burning Brakes
Joined: Apr 2012
Posts: 1,084
Likes: 96
From: Bowmanville Ontario
When I got my 74, same problem. Mine was the cable. The manufacturers say it's a two part cable. That was out of stock so I got the single cable and everything works perfect...for the last 2 years.
Very easy fix with the car lifted up on ramps. Had my 16 year old daughter push the cable thru the firewall while I aligned it into the tack.
Ken
Very easy fix with the car lifted up on ramps. Had my 16 year old daughter push the cable thru the firewall while I aligned it into the tack.
Ken
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski