correcting a slow speedo/odometer

[bajapapa]

After installing 33" tires on my fj62 the speedo is approx. 4-5 mph slow. Read somewhere drive & driven speedo gears from a fj60 would dial in gauge to +- 1 mph from correct reading. Where can i find the gear tooth count to get me back into the stock calibration?

 

[cruisermatt]

Any speedo gear from an FJ60 should work.

 

[daytonadogie]

I think the tooth count is 18 on a 62, and 16 on a 60. I made the switch on my 62 with 33's, and it got me within 2 mph. You need to change the gear on the output shaft too, they are a matched set.

 

[OGBeno]

^^^ This is correct. Have to do both the speed nylon gear as well as the gear on the output shaft.

Correct PN's:

33481-60061 (6 "teeth") Gear on Transfer.
33403-69075: (16 "teeth") speedo nylon gear.

 

[EastCanFJ62]

Finally mystery solved......This explains why the 17 tooth gear that I bought last year didn't work on my 62.. they told me it was the correct one for 31 inch tires but they failed to explain the gear on the transfer..probably because they had no idea...
speedo gear 6x18 vs 6x16

 

[Godwin]

Or install a GPS and use that as your speedo.

^^^ This is correct. Have to do both the speed nylon gear as well as the gear on the output shaft.

Correct PN's:

33481-60061 (6 "teeth") Gear on Transfer.
33403-69075: (16 "teeth") speedo nylon gear.

This is good tech, somewhat, obscure tech. I think this is the first time I've seen mention of the need to swap the gear on the transfer when swapping the nylon gear with a different tooth count.

 

[OGBeno]

Or install a GPS and use that as your speedo.


This is good tech, somewhat, obscure tech. I think this is the first time I've seen mention of the need to swap the gear on the transfer when swapping the nylon gear with a different tooth count.

I did this on my 70 series just recently as well.

 

[Godwin]

I did this on my 70 series just recently as well.

Did you get the model that reports speed as miles/day?

 

[doug720]

A GPS for speedo use is OK, but the odometer function does not work well when it comes to twisty roads and up and down hills. It can not compensate for these terrains. I have compared a GPS odo and wheel triggered electronic odo on my motorcycle used to layout enduro's where mileage must be correct to 0.001 miles over many miles.

The GPS would be off up to 1.5-2 tenths per mile. The gps assumes straight and level, so they get fooled.

On the highway, no problem, but even twisty paved roads will fool a GPS odo.