Bronco638
Nobody Home
- Joined
- November 17, 2003
- Messages
- 1,585
- Reaction score
- 12
- City, State
- Elk Grove, IL
- Year, Model & Trim Level
- '17 Expedition XLT
I originally found this on The Ranger Station site and thought I'd repost (since I see a lot of members asking for speedo gear info).
Manual Transmissions and all 4x4s:
16 tooth wine(C0DZ-A)
17 tooth white(C3DZ-C)
18 tooth yellow(C0DD-B)
19 tooth pink(C0DZ-B)
20 tooth black(C1DZ-A)
21 tooth red(C4OZ-A)
2WD Automatic Transmissions:
16 tooth blue(D0AZ-A)
17 tooth green(C7SZ-A)
18 tooth gray(C7SZ-B)
19 tooth tan(C7VY-A)
20 tooth orange(C8SZ-B)
21 tooth purple(D0OZ-B)
Here's the link to the info on The Ranger Station:Speedo Gear data
I just swapped in 4.10 axles with 32" BFGs. I used 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:
~19 = ( 7 * 4.10 * 655 ) / 1000
Hope this helps - Dave.
Manual Transmissions and all 4x4s:
16 tooth wine(C0DZ-A)
17 tooth white(C3DZ-C)
18 tooth yellow(C0DD-B)
19 tooth pink(C0DZ-B)
20 tooth black(C1DZ-A)
21 tooth red(C4OZ-A)
2WD Automatic Transmissions:
16 tooth blue(D0AZ-A)
17 tooth green(C7SZ-A)
18 tooth gray(C7SZ-B)
19 tooth tan(C7VY-A)
20 tooth orange(C8SZ-B)
21 tooth purple(D0OZ-B)
Here's the link to the info on The Ranger Station:Speedo Gear data
I just swapped in 4.10 axles with 32" BFGs. I used 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:
~19 = ( 7 * 4.10 * 655 ) / 1000
Hope this helps - Dave.
