speedometer error

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Oct 31, 2008 | 02:19 PM

palazzopl

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Pro

Joined: Oct 2005

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From: Boynton Beach Florida

speedometer error

I removed my cruise control on my 81 auto and replaced the cable direct to the tranny. Now it reads 5 mph higher at all speeds. Do I need a different tranny gear..

Oct 31, 2008 | 02:23 PM

...Roger...

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Joined: May 2006

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From: Dayton, Ohio

Are you sure that the extra 5 is not correct? I usually do the milemarker thing on the highway. 5miles =5 min.
If it is off then yes you can change the trans gear.

Oct 31, 2008 | 02:43 PM

palazzopl

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From: Boynton Beach Florida

I checked the MPH with my gps still 5 mph high

Oct 31, 2008 | 02:51 PM

...Roger...

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From: Dayton, Ohio

Quote:

Originally Posted by palazzopl

I checked the MPH with my gps still 5 mph high

Oops forgot about the new high tech stuff....barely know how to spell gds

I think your going to need about 2 more teeth on your gear.If I remember right its about 2.5 mph per tooth.Someone should pop in and confirm.

Oct 31, 2008 | 03:01 PM

wombvette

Le Mans Master

Joined: Jan 2000

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From: New Hill NC

It shouldnt have made any difference. Its direct drive.

Oct 31, 2008 | 03:32 PM

palazzopl

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From: Boynton Beach Florida

the original came with a two piece cable with the cruise module in the middle. now it goes direct to the speedometr

Oct 31, 2008 | 03:33 PM

palazzopl

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From: Boynton Beach Florida

the original came with a two piece cable with the cruise module in the middle. now it goes direct to the speedometer

Oct 31, 2008 | 05:43 PM

7T1vette

Team Owner

Joined: Jan 2006

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From: Crossville TN

Theoretically, it shouldn't change. But, the transducer may have been slipping and had a gear change already. If it reads too high, you'll need a gear with 1 or 2 more teeth.

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Oct 31, 2008 | 07:58 PM

DC3

Melting Slicks

Joined: Apr 2001

Posts: 2,030

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From: Lubbock Texas

Mine was reading high due to the smaller tires the previous owner put on. I corrected mine by going back to the correct tire height when I changed tires and wheels.

If you happen to be in need of tires, you could affect the change you want by selecting the right size tire.

DC