Bouncy speedo - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 5 (permalink) Old Nov 17th, 09, 06:45 PM Thread Starter
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Patrick
 
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Location: SW Florida
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Bouncy speedo

Anyone else have a bouncy speedometer or is it just me?

Also, mine runs about 10MPH fast. Any adjustment on the back?

68 SS cluster

1968 Convertible L92 VVT project, Hotchkiss lowering front & rear.

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post #2 of 5 (permalink) Old Nov 17th, 09, 07:06 PM
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Steps
 
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Re: Bouncy speedo

1/ disconect from the trans and pull the cable out, clean down and rub GREASE into it , then wipe off the acess...do not use oil, this can creap up the capble into the speedo.
2/ If above doesnt work could then be miss matched trans drive and speedo cable drive sizes
3/Could be the clips that hold the trans drive inside the tail shaft has slipped or fallen out.

My Spelling is not incorrect...it is creative

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post #3 of 5 (permalink) Old Nov 18th, 09, 05:09 PM
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Re: Bouncy speedo

Steptoe covered the service aspect pretty well. As for the 5mph difference, you'll probably need to change the speedo gear(s) in the transmission.

There is a plastic (usually) ring gear on the tail shaft of the transmission. The speedo cable mates with a plastic pinion gear. One screw / bolt will allow the speedo pinion assembly to pop out the side. Note the color of the ring and pinion gears.

Go to your local chevy dealer and tell them the gear colors you have, the speedo error (5mph) and transmission style and they should be able to give you the correct gears to make it work.

There are a few different pinions that mate with any given ring, but depending on how far you need to go, you may have to replace the ring gear as well. That involves removing the drive shaft, and the transmission tail shaft housing and slipping the new ring on. It's not a big deal, but does require some basic mechanical skill.

Steptoe also mentioned that the gears may be mismatched. As I was saying about the compatability of rings and pinions, someone may have slapped a different pinion in there trying to accomindate a rear end gear ratio change and got them mismatched. I think your GM dealer will be able to tell what's what with the color info you give him.

If you know the rear end ratio and tire heigth, that may be useful, although usually just knowing what you currently have for speedo gears and the amount of error is enough to get it right.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #4 of 5 (permalink) Old Nov 18th, 09, 06:18 PM Thread Starter
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Patrick
 
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Posts: 575
Re: Bouncy speedo

Thanks very much guys. Need a handheld GPS to see exactly where its at.

1968 Convertible L92 VVT project, Hotchkiss lowering front & rear.

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post #5 of 5 (permalink) Old Nov 18th, 09, 07:38 PM
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Re: Bouncy speedo

Run a search on the speedo gear in the last couple days there have been several one I and others mention how to work out the number of teeth u need...chances are it will be 3 teeth more than what is in there now.

Im sure that there is a virus... I posted up a couple questions then nexting everyone has similar questions lol
Speedo flu virus ???

My Spelling is not incorrect...it is creative

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