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

Tom · 05-07-2003, 01:45 PM

MY speedometer will not read correctly. ONce it gets up to a indicated 60mph [really 50mph] it starts bouncing around also. I know the gears in the tranny are correct for my setup. The speedo cable is good and hooked up correctly. So this leaves only the actual speedo to be wrong, right? Is it possable somthing inside I can fix, or do I need a new one?

LOHRTBT · 05-07-2003, 01:50 PM

Usually it because the cable is shot or because its binding up somewhere that causes teh bouncy action;

MylilBowTie · 05-07-2003, 09:13 PM

It could also be where the plastic housing for the cable was dry and it has worn it down and has slop in it now. I would try a cable housing or a different speedo.

**swervin ervin** · 05-07-2003, 11:02 PM

What do you mean by really 50 mph? Then you say the tranny speedo gears are correct for your setup. If they are correct, why is the speedo reading not?

Just curious here.

Oh, and I agree with guys on their suggestions.

jimfulco · 05-08-2003, 11:52 PM

Mine used to dance like that until I pulled out the cable and coated it with wheel bearing grease.

Tom · 05-09-2003, 10:28 PM

Quote:

Originally posted by swervin ervin
What do you mean by really 50 mph? Then you say the tranny speedo gears are correct for your setup. If they are correct, why is the speedo reading not?
Just curious here.

I tried driving my truck and had my friend with a cell phone next to me with two different vehicles till they said 50mph [99 accord,97 mustang] and both times my truck read 60mph. I know the gears are correct because when I orderd my tranny they asked what my tires would be, rims, and rear gear ratio my rearend had to ship the correct gears [they cost extra I think]. I pulled the cable several times [it was like new condition] and coated it with grease because it used to squel[sp??], now its quiet but still dosent work correctly. I think Ill try the new housing.

PHOENIX · 05-09-2003, 10:34 PM

Make sure there are no tight bends.
All turns should be smooth and large.

Check the connection at the gauge too.
If you are hearing sounds inside, I would check the connection at the gauge.
Also from the engine bay, try pulling the cable out a little bit.
If you have it in too far (behind dash, not in gauge) it can put pressure on the back of the gauge and cause this too.

05-07-2003, 01:45 PM	#1
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	speedo problem? MY speedometer will not read correctly. ONce it gets up to a indicated 60mph [really 50mph] it starts bouncing around also. I know the gears in the tranny are correct for my setup. The speedo cable is good and hooked up correctly. So this leaves only the actual speedo to be wrong, right? Is it possable somthing inside I can fix, or do I need a new one? __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

05-07-2003, 01:50 PM	#2
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Usually it because the cable is shot or because its binding up somewhere that causes teh bouncy action; __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

05-07-2003, 09:13 PM	#3
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	It could also be where the plastic housing for the cable was dry and it has worn it down and has slop in it now. I would try a cable housing or a different speedo. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

05-07-2003, 11:02 PM	#4
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	What do you mean by really 50 mph? Then you say the tranny speedo gears are correct for your setup. If they are correct, why is the speedo reading not? Just curious here. Oh, and I agree with guys on their suggestions. __________________ Mike 1985 Chevy C-10

05-09-2003, 10:34 PM	#7
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Make sure there are no tight bends. All turns should be smooth and large. Check the connection at the gauge too. If you are hearing sounds inside, I would check the connection at the gauge. Also from the engine bay, try pulling the cable out a little bit. If you have it in too far (behind dash, not in gauge) it can put pressure on the back of the gauge and cause this too. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

05-08-2003, 11:52 PM	#5
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Mine used to dance like that until I pulled out the cable and coated it with wheel bearing grease.

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