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Old June 14th, 2010, 06:05 PM
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Kelby Saxton
1994 Defender 90
Join Date: Apr 2010
Location: Harrisville, Utah USA
Posts: 66
new gears speedo way off

Is there a simple way to correct the speed variation on a 94? I recently had 4.14 gears installed and went to a 285 tire and my speedo is around 17 mph. off at higher speeds and with the speed governer I am only able to go about 72 mph. I have heard that you can do a pick up off a 97 or a disco and use a VDO speedo, but I would really like to stay with the factory speedo.

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Old June 14th, 2010, 06:27 PM
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1997 D90 ST #1444
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Location: Georgia
Posts: 5,181
Two options... Put 35's on or install a VDO speedo, where you can calibrate the speedo to your gears/tires.


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Old June 14th, 2010, 08:32 PM
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Johnathan Tisdale
93 110, 90 RockRR buggy
Join Date: Oct 2003
Location: USA
Posts: 818
looks like you have a 94, you can try this cheaply to see if it helps. I did this in my 90 and it worked well. use the search there are several threads on this from the past.

QUOTE=ECR]Use the speedo drive gear form a RR Classic, FRC9339 is the part #. It will cure your roughly 5 mpg overread issue.
Cheap and easy and no need for any custom work.
Most NAS 90s came with the tan drive gear that reads too high. The Black RR Classic gear corrects the issue with 2 more teeth.

Neat piece of information. Thanks for sharing it.
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