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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: jseifert on February 21, 2007, 03:38:00 am

Title: HELP!!! With Speedo adjustment
Post by: jseifert on February 21, 2007, 03:38:00 am

By Speedo I am not talking underwear....

But anyway! I do not have the stock size tires on my '86. And I think that my speedometer is off.... What would be an easy way to check this??? without involving the cops

And assuming that it is off... How do I go about correcting this problem?

Any advise would be greatly appreciated!!

Thanks in advance.

Title: Re: HELP!!! With Speedo adjustment
Post by: joesgarage71 on February 21, 2007, 08:17:00 am

You can check it by keeping pace with a friends truck, Making note of your speed at when your friends going  30,40,50,55, and 65.
You can try to correct it by changing the gears for the speedo.Or take it to your local speedometer shop.
Steve
 

Title: Re: HELP!!! With Speedo adjustment
Post by: jseifert on February 21, 2007, 09:13:00 am

Thats what I figured, but I have never messed with a speedometer, so I wanted to see before I screwed something up... Thanks a lot.

Title: Re: HELP!!! With Speedo adjustment
Post by: Lt.Del on February 21, 2007, 12:55:00 pm

just take it to a shop and they will calibrate it.  it wont cost much.   call your local shops and they'll tell you if they do this or recommend a shop 4 u

if you live near an interstate, look at their mile markers and note your speedo.  If your speedo says you went .8 miles and you pass another mile stick, well, your rear end has a modified gear ratio now due to tires.   If your speedo says you went 1.2 miles between yardsticks, well your wheels are too small. Either way, shops will have the plastic gears to put on end of speedo cable to calibrate it.  

SgtDel
aka "Andy"

www.delbridge.net

1979 Big 10 383 stroker
1991 Blu 'Burb 3/4 ton 4x4

Edited by: SgtDel  at: 2/21/07 12:58 pm

Title: Re: HELP!!! With Speedo adjustment
Post by: DnStClr on February 21, 2007, 08:49:00 pm

Welcome to the site, jseifert. Just to clarify- the guys mean tranny shops for the speedo checks.  

Don St.Clair
Culleoka Tn

Title: Re: HELP!!! With Speedo adjustment
Post by: jseifert on February 21, 2007, 10:37:00 pm

Thanks. I hope to hang around for a while...

And thanks for the clarity, I assumed that was what was meant, but I wasn't sure.

Title: Re: HELP!!! With Speedo adjustment
Post by: Lt.Del on February 21, 2007, 10:48:00 pm

That really depends.  Being in law enforcement, i know the shops that do calibrations around me, and as said, ask around, the guys in the business know who does calibrations.  About a mile from me, an AC shop does calibrations.  

SgtDel
aka "Andy"

www.delbridge.net

1979 Big 10 383 stroker
1991 Blu 'Burb 3/4 ton 4x4

Title: Re: HELP!!! With Speedo adjustment
Post by: roundedline on March 01, 2007, 04:14:00 pm

Read this article on speedo calibration:
73-87.com/7387garage/driv...speedo.htm

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project