Speedo drive

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ajcmbrown

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Without dragging my old but under the car in the dark, can anyone who has had experience with the speedo drive on a td27 gearbox tell me if it is a traditional driven gear on the speedo sender?

My reason for asking is simple, I have put 31" tyres on my poor old Navara and now my speedo is a fair way out.

In my distant memory from being a spare parts interpreter, speedo driven gears come in different colours, each with a slightly ratio so that if different sized wheels/tyres/diff ratios are used then it could be compensated for by using the appropriate coloured gear.

I dont even know if the 96 Navara uses this type of sender or not, maybe someone here can advise if this is the case.

Alternatively, if anyone has a spares listing or a link to a spare parts catalogue, I could find out for myself.

I have searched but could not find any.

I am probably being optimistic that such a simple fix could solve my speedo reading, but stranger things have happened.
 
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Yes. The gears are the same whether cable driven or electronic. I don't know the colours, the 4.625 pictured below is red, I forget what colour the 4.8:1 was (also red maybe?). You need a gear from the next tallest ratio if you're running bigger tyres.

BuildLog017_005.jpg
 
Looks like I need to remove mine and count the teeth, then buy one with one less tooth to start with, since I think mine is reading under by about 10%, maybe try two teeth less.
 
This will be of interest to anyone who has changed their tyres to non standard Diameter.

I changed my standard tyres to 275/70/17's and this caused the speedo to read under by 6%.

I investigated fitting an electronic switch to convert the signal but having had a Jeep before and changing tyres and gears a few times I wanted to correct the problem at the SOURCE and not the dash display.

After almost NINE months I finally found the part numbers and a big thanks go to Wayne at Blackburn Nissan 4x4 for getting this for me.

The standard pinion speedometer gear on a 3.0L GU Manual has 17 teeth and in my case my speedo is reading 6% below the actual speed.

So to calculate the correct gear:
Standard Gear = 17 Teeth
Speedo Error = 6% Below
6% of 17 = 1.02
Number of teeth Required = 16 (17-1)

Of course if your speedo is reading higher then the actual speed then you need to add teeth.

The following part numbers are needed to order the correct gear:

32743-VB015 15 Teeth
32743-VB016 16 Teeth
32743-74P17 17 Teeth
32743-74P18 18 Teeth
Cost approx $50.

Again - Thanks to Blackburn Nissan 4x4 for this information.

To install the gear:
I have documented the steps in a series of pictures below.

1) Locate the pinion speedo gear Housing - just next to the Handbrake Drum at the rear of the gearbox.

2) Using a 10mm socket - remove the screw on the side of the housing and
slowly pull the housing out. Warning - you will lose about a cup of gear oil
so place a bucket under the gear box. Dont worry - it will run out and stop
after about 10 seconds

3) Remove the old gear (Black in Picture)
The gear is held on by a C-Clip which uses tiny holes. I just used a
screw driver to remove it.

4) Put the new gear on the spindle (Yellow) and re-attach the C-Clip

5) Push the gear housing back into the gear box. It will need a slight tap to
reseat the O-Ring. And screw in the bolt (dont over tighten).

Took the car for a drive and it is reading almost 100% accurate with the GPS.

This is the best $50 I have spent on my car.

PS: In case you are wondering - I did top up the gear box oil.

Happy new year and regards

Count the teeth on your gear and divide it by the percentage your's is out.
 
Thanks Dave, I will check it against my GPS, I would still like it to read a little high if anything so that I have that safety buffer with speed cameras or if someone else drives it and doesn't realise that its not "optimistic" like almost all factory speedo's are by about 4-5%.

If it is out by 10% I will go down two teeth (Assuming 17 teeth, 1.7 teeth would make it accurate) so it still has a slight buffer.

Now I just need to find a Nissan dealer who knows what they are talking about.

I did find some info online here 1995 Nissan Hardbody Pickup (1995-1997) Speedometer Pinion - 3271067 and it seems that the Navara speedo gears are way cheaper ($16 vs $60-70) than Patrol gears.

It would be a good idea to have a thread listing the different part numbers for different gears to fit Navaras.
 
But they dont seem to list D21 Navara, only D22. I suppose they can still supply any Nissan parts though.
 
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He's more of a person than a business, just email him and he can get anything that Nissan stocks.
 
red is 4.6 diff purple bluey one is 4.8 red has 20 splines other has 21 mainly in terranos
 

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