RE: Speedo Gear Assembly

[andybudge]

I know there are other threads on this forum on this topic but i am having trouble calculating what gear would best suit my gearing and tyre size?
The Speedo is way out in reading(checked with GPS) and I would like to rectify it.
Advice appreciated if anyone has been 'down this road' before?
I have a 1/1977 FJ45 with 16" wheels running 16/7.5 tires. Diff ratios have been changed to 3:73. It has the standard 4 speed gearbox.

 

[45Kevin]

My 78 came with 4:10 gears and 7.50/16 tires.

All that info should be in the owners manual, if you still have it.

 

[andybudge]

Can anyone advise on what speedo gear I need for 3.7/1 diff ratio with 16 x 7.5 tyres?