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Hello All
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
Marc
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
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
Marc
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