Speedo sticking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blue 72 gmc 4x4 · 07-19-2010, 08:25 PM

So I've replaced the speedo cable and it worked fine for quite awhile, now it is sticking so when I stop it stays at like 10 mph but when I back the truck up it will go down to zero. Does anyone know what is with this thing?!?!?! it's really starting to piss me off!!

Thanks in advance

blue 72 gmc 4x4 · 07-20-2010, 11:35 PM

anybody know why this might be happening??

Codypaul · 07-21-2010, 01:31 AM

i think you need to lube the cable.

cdowns · 07-21-2010, 07:22 AM

yes i'd lube the cable with the proper graphite based speedo cable lube available at the autoparts store

68gmsee · 07-21-2010, 10:08 AM

I suspect the speedometer assembly.

Uou can lube the cable to see if it helps but the cable never actually touches the speedometer needle. The cable turns a magnet inside a free spinning assembly. Eddy currents created by the spinning magnet turn the assembly and the needle.

I suspect it's the spinning assmebly that's sticking. I've never actually taken them apart to see if there are lube points. I've replaced them in the past.

blue 72 gmc 4x4 · 07-22-2010, 10:14 PM

the cable's brand new..so I know thats not the problem. 68gmsee that sounds like what might be happening, so I'll see if I can fix it and if not I have a spare!

raycow · 07-23-2010, 10:54 AM

This happens when the lube gets old and sticky. It is fixable, but you will need to disassemble the speedo so you can clean and oil the pivot points.

Ray

07-19-2010, 08:25 PM	#1
blue 72 gmc 4x4 Registered User Join Date: Jul 2009 Location: Aladdin Wy Posts: 796	Speedo sticking So I've replaced the speedo cable and it worked fine for quite awhile, now it is sticking so when I stop it stays at like 10 mph but when I back the truck up it will go down to zero. Does anyone know what is with this thing?!?!?! it's really starting to piss me off!! Thanks in advance

07-20-2010, 11:35 PM	#2
blue 72 gmc 4x4 Registered User Join Date: Jul 2009 Location: Aladdin Wy Posts: 796	Re: Speedo sticking anybody know why this might be happening??

07-21-2010, 01:31 AM	#3
Codypaul Registered User Join Date: Apr 2010 Location: Duluth MN Posts: 64	Re: Speedo sticking i think you need to lube the cable. __________________ 1970 GMC K1500 1993 Chevy K2500

07-21-2010, 07:22 AM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Speedo sticking yes i'd lube the cable with the proper graphite based speedo cable lube available at the autoparts store __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

07-21-2010, 10:08 AM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Speedo sticking I suspect the speedometer assembly. Uou can lube the cable to see if it helps but the cable never actually touches the speedometer needle. The cable turns a magnet inside a free spinning assembly. Eddy currents created by the spinning magnet turn the assembly and the needle. I suspect it's the spinning assmebly that's sticking. I've never actually taken them apart to see if there are lube points. I've replaced them in the past.

07-22-2010, 10:14 PM	#6
blue 72 gmc 4x4 Registered User Join Date: Jul 2009 Location: Aladdin Wy Posts: 796	Re: Speedo sticking the cable's brand new..so I know thats not the problem. 68gmsee that sounds like what might be happening, so I'll see if I can fix it and if not I have a spare!

07-23-2010, 10:54 AM	#7
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: Speedo sticking This happens when the lube gets old and sticky. It is fixable, but you will need to disassemble the speedo so you can clean and oil the pivot points. Ray



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.