Topic: Speedometer Gear Ratio

[rockymtn89]

Hi All,

I searched for this but didn't find a definite answer. I have an '89 4Runner with 4.7s in the rear case. I need to replace the speedometer driven gear and would like to slow down my speedometer (it reads too fast) as much as I can. Currently, I have a 6x19 driven plastic gear in the t-case. If I want to slow down the speedometer, should I order a 6x18 or a 6x20 speedometer gear? Does a larger number speed up or slow down the cable? I've heard both ways on other sites (Pirate) but usually get the most sensible tech here.

Thanks!

[rockymtn89 [OP]]

No one knows? Simpler may be better: If I want to slow down my speedometer, do I need a plastic gear with more or less teeth?

[twistedtoy92]

i didnt think you could get different speedo gears in these? more teeth on the larger gear will slow it down, for example 6&20=3.33, 6&19=3.161, 6&18=3.0   the lower the number the higher the gear ratio thus turning faster.

[rockymtn89 [OP]]

Thanks! Yeah, there are three variations, and from what I've heard you just have to make sure that the teeth have the same cut and that it's 2wd or 4wd. I don't know how much change I'll actually have, but I'm going to give it a try.