speedo gear for 32s

[chillywilly]

Well last week I did the tt and shackels this week I got my 32s ats. Anyone know from presonal experience what gear I need for my speed sensor? I went from 225s to 32s . Looks great ..not a soccermom ride anymore lol.Thanks for the encouragement to go 32s almost did 31s. Wheww!

 

[410Fortune]

what gears are in your axle?

What gear is in your t case now?

Its not a simple answer, it varies. You can do the math.

I believe the calculation is still on therangerstation.com

I am guessing 19 or 20 tooth depending on what gear ratio you have in your diff

 

[chillywilly]

Sorry forgot, the gear ratio in rearend is 3.55s

 

[Bronco638]

Use the Ford Motorsport formula:

Driven Gear Teeth = (Drive Gear Teeth x Axle Ratio x Tire Rev. Per Mile) / 1000

There are 7 teeth on the gear in my BW1354 (and since the speedo worked fine with my 4405, I'll assume there's 7 teeth on that gear too). You can find the tire's revolutions per mile under the "Specs" link on TireRack.com. From there it's simple math:
? = ( 7 * your axle ratio * 677 ) / 1000

I have a ScanGauge and the speedo and SG readout are almost identical. There are 32" BFGs on my Ex, too. However, I have 4.10 axles. This is the formula I used.

 

[chillywilly]

Thanks Bronco this works out good Im putting in 4.10s next week. 7teeth sounds right . thanks again

 

[Bronco638]

7 is the number of teeth on the gear inside the transfer case. With 4.10 axles, you'll need a 19 tooth speedo gear.

 

[chillywilly]

oops misread thanks again!!