Drive Ratio in 83 FJ60? (1 Viewer)

[roverpilot]

What was the stock rearend drive ratio in FJ60, 1983? Thanks, Rob

 

[stinkyfj60]

3.70

 

[roverpilot]

Tankya...

 

[SurfPonto]

3.70

Not to split hairs but I thought they were 3.73 ?

Bob

 

[FJ60Cam]

On FJ60 37 tooth ring gear / 10 tooth pinion = 3.7 gear ratio

On FJ62 37 tooth ring gear / 9 tooth pinion = 4.11 gear ratio

 

[NorCal60]

Not to split hairs but I thought they were 3.73 ?

Bob

Yep, 3.73's.

 

[FJ40Jim]

Yep, 3.73's.

This is complicated math.

Dividing 37 by 10 usually results in 3.70

But if we're gonna make up numbers, I've decided my Cruiser has 5.13 gears in the axle. Yeah, 37/10=5.13.
Let's wheel, I'm ready to crawl.

 

[NorCal60]

I was told it was 3.73, my bad.

Now I feel like a dip****.

 

[stinkyfj60]

I think the misconception comes from the fact that many US vehicles of the same era have 3.73s.

 

[Southbound]

Cool, never knew exactly how a gear ratio was defined.

 

[GulfShoresFJ60]

So technically, if one wanted to could you just change the pinion to a 4.11 pinion? The ring gear has the same tooth count, so theoretically you could change the pinion to get the 4.11 gear ratio. Just a ponder. If anyone knows about this I would be intrigued to know. Thanks.

 

[FJ40Jim]

No, the ring or pinion cannot be changed separately. They are a matched set.
Even though the tooth count is the same, the two ring gears are differnet thicknesses to move them closer/farther fromt the larger/smaller diameter pinion.

 

[GulfShoresFJ60]

Thanks Jim, That makes sense, I haven't had a 3.7 and 4.11 set together to compare them. Just thinking. Well thanks for the response.