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Speedometer not reading accurately

  • Thread starter Thread starter Reyyyyab
  • Start date Start date Jul 18, 2020
R

Reyyyyab

Member
Mar 16, 2020
98
7
8
South Carolina
Jul 18, 2020
#1
  • Jul 18, 2020
  • #1
I bought a new speedometer cable and the correct speedometer gear for my 4.11 gear car. & its Still not reading right. It bounces like crazy. I changed the speedometer from 85 to 140. Could that be the problem?
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
7,387
2,745
194
Kearney, NE
Jul 18, 2020
#2
  • Jul 18, 2020
  • #2
If you lubed the cable and are absolutely sure you did not bend the cable end during installation, I suspect the speedometer head is worn or needs cleaning. The dealership had an old can of liquid graphite for the occasional cable installation because the cables come packaged dry, and the lube pack is often missing from the box.
 
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R

Reyyyyab

Member
Mar 16, 2020
98
7
8
South Carolina
Jul 19, 2020
#3
  • Jul 19, 2020
  • #3
7991LXnSHO said:
If you lubed the cable and are absolutely sure you did not bend the cable end during installation, I suspect the speedometer head is worn or needs cleaning. The dealership had an old can of liquid graphite for the occasional cable installation because the cables come packaged dry, and the lube pack is often missing from the box.
Click to expand...
I didn’t lubed the cable. Im 100%sure i didn’t bend the cable. What can i used to lube the cable & clean the speedometer head?
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
7,387
2,745
194
Kearney, NE
Jul 19, 2020
#4
  • Jul 19, 2020
  • #4
Without some lube, the inner and outer cables will wear and bind. It will not be a smooth, rotating action. LMR sells this, but they are out.

Dorman Speedometer Cable Graphite Lubricant 03344 - LMR

Keep your 1979-1993 Mustang speedometer cable functioning properly with this speedometer cable graphite lubricant.
lmr.com
This is close to the “liquid graphite” the dealership had for cables.
Advance Auto Parts - Down for Maintenance
The packs used to be a pack of some green goo. Anything oil or grease would need to not thicken up at at cold temps. That’s why graphite is a good idea.
In a fifteenth car, the inner cable end was bent during installation, and it gave the speedometer a severe palsey. It sounds more like a drag somewhere in your case.
 
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