speedometer worn out? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71chevylongbed · 08-25-2004, 12:00 AM

the other day my speedo needle started bouncing and then it stopped working and now only works every once in a while but when it does the needle bounces all over? is it time for a new speedo or is it the cable or drive gears in the tranny?

canadianchevy72 · 08-25-2004, 01:13 AM

Im inclined to assume its just the cable mine did that when it broke butit just bounces and never shows any decent speed.

donkey69 · 08-25-2004, 02:49 AM

Sounds like you have a bad cable......

jimfulco · 08-25-2004, 11:27 PM

Undo the cable at the transmission, & chuck the end of the cable into a cordless drill. Run the drill (I forget which direction, try both) while someone watches the speedo, & if it still screws up, it's the cable or speedo head. If it works OK, check the driven gear that the cable was hooked to. If it's OK, check the drive gear on the trans output shaft (it should not move on the shaft if you stick your finger in & try to move it).

bmg · 08-26-2004, 02:00 AM

well mine did the same thing and finally just stopped working. the odometer still works just not the spedo so i just use the rpm gage for my spedo.

08-25-2004, 12:00 AM	#1
71chevylongbed Got Horsepower? Join Date: Sep 2003 Location: IDAHO Posts: 406	speedometer worn out? the other day my speedo needle started bouncing and then it stopped working and now only works every once in a while but when it does the needle bounces all over? is it time for a new speedo or is it the cable or drive gears in the tranny? __________________ 2001 Dodge 2500 Cummins, 4 inch lift, 35" Toyo MT's on Ultra wheels, P-Pump Conversion, AFE intake, Fass, 5 inch exhaust, Pyro,Boost,and Fuel pressure guages, and a whole bunch of other stuff "The Money Pit" SOLD-71 Chevy C10 long bed- 2/4 drop-- 350,th400, Edelbrock performer RPM intake,Edelbrock 600 CFM carb,Crower 240 cam,port and polish,Dynomax headers,HEI ignition,dual 2.5 inch exhaust with Flowmaster 50 series mufflers

08-25-2004, 01:13 AM	#2
canadianchevy72 Registered User Join Date: Mar 2004 Location: Thorsby AB Canada Posts: 206	Im inclined to assume its just the cable mine did that when it broke butit just bounces and never shows any decent speed. __________________ 1972 Chevy C/10 350/200r4

08-25-2004, 02:49 AM	#3
donkey69 JB-80 &quot;Twice as Good&quot; Join Date: Jun 2004 Location: Central, MN Posts: 354	Sounds like you have a bad cable...... __________________ HEY NOW!

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08-25-2004, 11:27 PM	#4
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Undo the cable at the transmission, & chuck the end of the cable into a cordless drill. Run the drill (I forget which direction, try both) while someone watches the speedo, & if it still screws up, it's the cable or speedo head. If it works OK, check the driven gear that the cable was hooked to. If it's OK, check the drive gear on the trans output shaft (it should not move on the shaft if you stick your finger in & try to move it).

08-26-2004, 02:00 AM	#5
bmg Registered User Join Date: Nov 2001 Location: Indianapolis, IN USA Posts: 157	well mine did the same thing and finally just stopped working. the odometer still works just not the spedo so i just use the rpm gage for my spedo.



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