speedo gear

[OutOfStep]

I went down today to the local speedotac place and tried to get a new speedo gear. The guy said he couldnt tell me what I needed without either knowing the size of the gear in the transmission that the speedo gear runs on, or running it on the dyno ($85 dyno & installed). I really dont want to pay $85 for 5 minutes of work. I am currently running the '03 5spd manual transmission, 3.07 gears, and 31" tires (upgraded from the stock 215 75 R15 I think). Would anyone know either the correct speedo gear I am looking for, the size of the transmission gear he was talking about, or if I could set up a simple ratio (# of teeth on original gear over tire size to unknown # of teeth over new tire size) to get the new correct gear?

Thanks,
Randy

 

[frankiefire702]

I believe you want a 27 tooth speedo gear for your current setup.http://www.4x4xplor.com/images/speedo/speedochart00.gif

 

[Bounty__Hunter]

Looks like you need a 27tooth gear.

www.sierrajeep.com/speedome.htm
www.jeeptech.com/javaAps/Speedo.html
www.stu-offroad.com/speedo/speed1.htm
www.4wheelerssupply.com/Tech/speedo_calculator.php

 

[Bounty__Hunter]

 

[OutOfStep]

Awesome, thanks a lot guys

 

[Sparky-Watts]

difference in rubicon lifts

Ok, this is too weird! I just logged in to ask pretty much the same question! I was wondering if there was a cross-reference chart or listing for determining the right speedo gear when I get my bigger tires, and you guys done posted it for me already! Man, I love this place!!!

 

[timthrower]

the chart is great. thanks. know where you can find a gear for a 84 cj 7 ?

 

[Bounty__Hunter]

No, but contact Tacoma Speedometer - Home as they've been great to me.