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

GREASEMONKEY72 · 02-19-2007, 09:38 PM

ok i posted a little while back about my speedo stoping at 85mph and asking why it wouldnt go over that, well i compared my speedo to my brothers truck a ford f-250 supercrew and found out that mine is about 5mph off from his so my question is, is the gears in the tranny the only thing controling the speed or is there gears in the speedo itself that could affect it, and could the gears in the tranny be the reason it doesnt count over 85mph??? o and just for refernce it went up to 85 and stayed then jumped to 90 and bounced around between them then went back to 85 and stayed, ok enough rambling

THANKS FOR ANY AND ALL HELP AND COMMENTS

GREASEMONKEY72 · 02-19-2007, 11:57 PM

ttt

Fred T · 02-20-2007, 12:04 AM

If the speedo jumps it's either the speedo or the cable. With a worn cable you usually get a lot of fluttering.

I would start by inspecting the cable. Disconnect at the speedo, and it pulls out of the housing. If it's frayed or worn, replace it. If the lube is dry, you can get some cable lube and work it into the cable. Graphite base grease, so it is a mess.

If that doesn't fix it, it will be the speedo. They can be rebuilt and calibrated. Sounds like you have worn or dry gears in the speedo, but the cable is an easier and cheaper fix.

GREASEMONKEY72 · 02-20-2007, 12:34 AM

ok thanks Fred T, ill do that and see what happens and go from there

02-19-2007, 09:38 PM	#1
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	speedo problem ok i posted a little while back about my speedo stoping at 85mph and asking why it wouldnt go over that, well i compared my speedo to my brothers truck a ford f-250 supercrew and found out that mine is about 5mph off from his so my question is, is the gears in the tranny the only thing controling the speed or is there gears in the speedo itself that could affect it, and could the gears in the tranny be the reason it doesnt count over 85mph??? o and just for refernce it went up to 85 and stayed then jumped to 90 and bounced around between them then went back to 85 and stayed, ok enough rambling THANKS FOR ANY AND ALL HELP AND COMMENTS __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME Last edited by GREASEMONKEY72; 02-19-2007 at 11:57 PM.

02-19-2007, 11:57 PM	#2
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: speedo problem ttt __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

02-20-2007, 12:04 AM	#3
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: speedo problem If the speedo jumps it's either the speedo or the cable. With a worn cable you usually get a lot of fluttering. I would start by inspecting the cable. Disconnect at the speedo, and it pulls out of the housing. If it's frayed or worn, replace it. If the lube is dry, you can get some cable lube and work it into the cable. Graphite base grease, so it is a mess. If that doesn't fix it, it will be the speedo. They can be rebuilt and calibrated. Sounds like you have worn or dry gears in the speedo, but the cable is an easier and cheaper fix. __________________ Fred There is no such thing as too much cam...just not enough engine.

02-20-2007, 12:34 AM	#4
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: speedo problem ok thanks Fred T, ill do that and see what happens and go from there __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME



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