Adjusted speedometer sender/transducer for '95 NAS 90 - Defender Source
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  #1  
Old January 30th, 2017, 05:01 PM
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Adjusted speedometer sender/transducer for '95 NAS 90

Guys/Gals,

I have been searching the threads to try and figure out if anyone with a '95 NAS 90 has been able to keep their original/OEM speedometer and has found an adjusted sender gear/transducer to mate up with the R380 with the original speedo wire. I have lifted my 90 to fit 35s with 4.11 axle gearing and for the life of me I cannot seem to find any threads on this use case (which I could have sworn somebody had done eons ago). Most if not all the threads call for replacing the speedo with an electronic VDO - which is not what I would prefer to do (I'd like to keep the original if possible). Does anybody run my setup and have a vendor they'd recommend for this use case?

Thanks in advance.
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  #2  
Old January 30th, 2017, 06:11 PM
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Sure. You change the speedo drive gear in the t. case.

How to replace the speedo drive gear on a Land Rover - The Land Rover Blog
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Old January 30th, 2017, 09:44 PM
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Quote:
Originally Posted by Red90 View Post
Sure. You change the speedo drive gear in the t. case.

How to replace the speedo drive gear on a Land Rover - The Land Rover Blog
My bad, I thought it was on the tranny...but thanks for this. I don't think this write-up has the correct sizing of the gears for my tire (tyre) size...all of them seem a bit smaller. Not only that, but the 3.54 to 4.11 gearing would also have to be accounted for as well.
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Old January 30th, 2017, 10:03 PM
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Your speedo will be running 6% faster than stock currently

4.11 / 3.542 * 32 / 35 = 1.06 If you have a 20 tooth gear now, a 21 should be pretty close. 1.06 * 20 = 21.2
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Old January 30th, 2017, 10:10 PM
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That said they usually read high to begin with so you should see exactly how far it is off and choose the best gear based on that.
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Old January 31st, 2017, 01:06 PM
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Based on GPS, it looks like the speedo is actually off by about 9% too fast
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  #7  
Old January 31st, 2017, 02:08 PM
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Then you want a 22 tooth gear, assuming you have a 20 now. 20/22 = 0.91 >> 9% reduction. You might want to see what is there first or just take a chance.

NAS manual says you should be 20 tooth, FTC2848 right now.

FRC3312 is the 22 tooth one used in 90s that came with small tires. My one concern is the NAs trucks show FTC2848 and the normal manual show FRC3310 for the 20 tooth. I'm not sure if there is some difference.
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Old January 31st, 2017, 08:29 PM
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Thanks John, I will give it a whirl...worse case it starts taking mileage off like in Ferris Beuller's Day Off, right?
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Old February 1st, 2017, 10:12 AM
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Ordered! Thanks again, John!
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Old March 9th, 2017, 04:14 PM
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So, update (In re-checking, the % difference was actually closer to about 15% off)

...I finally got around to installing the Yellow 22 teeth (FRC3312) and took out the handy dandy gps to check the speedo, and it's still slightly off. It's WAY better than it was, but still off by single digits when going about 60mph. I am going to order the Red 24 teeth (FRC3313) and give that a whirl. I think that will nip it in the bud...
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