speedo stuck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1968aj · 09-03-2009, 10:31 AM

my speedometer sticks at 30 mph. it will go up to 30and just hangs there. when i park the truck it remains stuckon 30. i can tap on the back of speedo while parked and it will drop back down but the next time i drive it the same thing happens.the truck is a 1968 cst.i have tried to post pictures but it will not work. i have posted other pictures in truckes for sale but it will not work here any help is appreciated

cdowns · 09-03-2009, 10:49 AM

step one//take out and clean and lubricate the speedo cable with speedometer cable lube NOT WHITE GREASE

tim21391 · 09-03-2009, 10:49 AM

id get a new speedo cable they are cheap.. maybe the speedo itself is bad? or maybe the thing on the tranny is broke

68gmsee · 09-03-2009, 12:03 PM

Wouldn't hurt to lube the cable but the cable just turns a magnet that produces a magnetic field that move the needle. Eddie currents.

More than likely you have a bad speedometer. Maybe taking it out, checking the connections, making sure the needle is not loose, etc. may help, but I would start looking for another one.

69GMCLonghorn · 09-03-2009, 01:01 PM

Quote:

Originally Posted by 68gmsee

Wouldn't hurt to lube the cable but the cable just turns a magnet that produces a magnetic field that move the needle. Eddie currents.

More than likely you have a bad speedometer. Maybe taking it out, checking the connections, making sure the needle is not loose, etc. may help, but I would start looking for another one.

I agree... Also think of it this way, it's probably about to fly south on you altogether. So learn something in the process. Get in there and break something and learn what's happening and how it works. You might scare yourself and actually fix it! And, if you screw it up, throw it in da guttah and go buy anuddah!

1968aj · 09-03-2009, 02:56 PM

thank for the input. i took the instrument cluster out and cleaned it &painted it. iput led bulbs in.when i reinstalledit is when this problem came up, itwas working brfore i took it out.

1968aj · 09-03-2009, 03:01 PM

i just read my post. i can spell good but cant type worth a ......

unclewatts · 09-03-2009, 03:11 PM

Quote:

Originally Posted by 69GMCLonghorn

I agree... Also think of it this way, it's probably about to fly south on you altogether. So learn something in the process. Get in there and break something and learn what's happening and how it works. You might scare yourself and actually fix it! And, if you screw it up, throw it in da guttah and go buy anuddah!

I agree. I really don't think it's the cable. Your needle is probably hanging up on the dial face. You need to disassemble the speedo and realign the needle. If that doesn't fix it, it's new speedo time.

1968aj · 09-03-2009, 04:19 PM

ok i think i will take it back out . i have a 72 parts truck. does anbody if the 72 speedo is the same as the 68?

68gmsee · 09-03-2009, 04:29 PM

Should all be the same. I think I took the one for my 69 out of a 72 GMC.

You'll probably see if there's any differences when you take them out and compare.

**john** · 09-03-2009, 04:30 PM

Did you pack the cable with grease? I over lubed a cable once and the grease got into the speedo head and acted the same way. Yes the 1968 unit will work.

unclewatts · 09-04-2009, 12:07 AM

Quote:

Originally Posted by 1968aj

ok i think i will take it back out . i have a 72 parts truck. does anbody if the 72 speedo is the same as the 68?

According to my catalogs they all list the same replacement speedo for years 1967-72 and they're about $75.00.

09-03-2009, 10:31 AM	#1
1968aj Registered User Join Date: Apr 2009 Location: houston texas Posts: 1,438	speedo stuck my speedometer sticks at 30 mph. it will go up to 30and just hangs there. when i park the truck it remains stuckon 30. i can tap on the back of speedo while parked and it will drop back down but the next time i drive it the same thing happens.the truck is a 1968 cst.i have tried to post pictures but it will not work. i have posted other pictures in truckes for sale but it will not work here any help is appreciated

09-03-2009, 10:49 AM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: speedo stuck step one//take out and clean and lubricate the speedo cable with speedometer cable lube NOT WHITE GREASE __________________ 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

09-03-2009, 10:49 AM	#3
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: speedo stuck id get a new speedo cable they are cheap.. maybe the speedo itself is bad? or maybe the thing on the tranny is broke __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

09-03-2009, 12:03 PM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: speedo stuck Wouldn't hurt to lube the cable but the cable just turns a magnet that produces a magnetic field that move the needle. Eddie currents. More than likely you have a bad speedometer. Maybe taking it out, checking the connections, making sure the needle is not loose, etc. may help, but I would start looking for another one.

09-03-2009, 02:56 PM	#6
1968aj Registered User Join Date: Apr 2009 Location: houston texas Posts: 1,438	Re: speedo stuck thank for the input. i took the instrument cluster out and cleaned it &painted it. iput led bulbs in.when i reinstalledit is when this problem came up, itwas working brfore i took it out.

09-03-2009, 03:01 PM	#7
1968aj Registered User Join Date: Apr 2009 Location: houston texas Posts: 1,438	Re: speedo stuck i just read my post. i can spell good but cant type worth a ......

09-03-2009, 04:19 PM	#9
1968aj Registered User Join Date: Apr 2009 Location: houston texas Posts: 1,438	Re: speedo stuck ok i think i will take it back out . i have a 72 parts truck. does anbody if the 72 speedo is the same as the 68?

09-03-2009, 04:29 PM	#10
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: speedo stuck Should all be the same. I think I took the one for my 69 out of a 72 GMC. You'll probably see if there's any differences when you take them out and compare.

09-03-2009, 04:30 PM	#11
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: speedo stuck Did you pack the cable with grease? I over lubed a cable once and the grease got into the speedo head and acted the same way. Yes the 1968 unit will work. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

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