Overview
It is a blue, 38-tooth speedometer drive gear for the NP231 transfer case. It corrects speedometer error that appears when tire size or axle gear ratio changes, since the MPH display can run high or low. Use the Tire and Gear Ratio Chart from Crown Automotive to select the right tooth count.
Key features
- 38 teeth for NP231 transfer case speedometer drives
- Listed color: blue
- Nylon gear body with a steel shaft
- Direct fit for NP231 transfer case speedometer drives
Keeping readings accurate
Speedometer accuracy depends on how many driveline revolutions occur per mile, and the speedometer gear sets the signal that the gauge reads. Anything that changes wheel rotation, including tire wear, a new tire brand or a different rim, can alter the reading over time. Checking the speedometer against a trusted reference after such a change keeps the display honest and avoids surprises at highway speeds.
The work is usually a matter of removing the old gear, cleaning the housing and seating the new one with its seal. Stay alert for leaks afterward. If readings remain off after the fit, the tooth count is the likely cause, and the chart should be consulted again before buying another gear.
- Check the reading after any tire change
- Clean the housing before fitting
- Watch for leaks after the first drive
- Use a reliable speed reference for comparison
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | 52067638 |
| UPC | 848399015294 |
| Tooth count | 38 teeth |
| Compatible transfer case | NP231 |
| Color | Blue |
| Gear material | Nylon gear with steel shaft |
Vehicle fitment
Its fit is for the NP231 transfer case, so confirm the transfer case and your present tire and axle gear combination before purchase.
Check that your vehicle’s year, model and trim match before ordering.
Installation notes
A 6035709 o-ring is needed for installation unless the factory o-ring is reused, so confirm which one you will use before the old gear comes out.
What’s included
A blue 38-tooth speedometer drive gear.
Not included: 6035709 o-ring, which must be purchased separately unless the factory o-ring is reused.
