The 3301-201 companion flange is a critical component for ensuring proper driveline function in NP203 and NP205 transfer cases. With a counterbore depth of 0.421 inches, this flange is engineered to fit securely and maintain alignment. If you notice vibrations or abnormal noises during operation, a worn or misaligned flange could be the culprit. Symptoms like these often point to issues with the flange face runout or improper installation.
This flange features a spline count of 32 and a spline diameter of 1.401 inches, which are essential for a snug fit with the corresponding yoke. The hub diameter measures 2.125 inches, and it includes a thru hole of 2.000 inches along with a pilot diameter of 2.000 inches. The dual bolt circle diameters of 3.5 inches and 4.25 inches, combined with 8 bolt holes designed for M12-1.75mm threaded bolts, ensure a secure attachment to the differential or transfer case.
When installing the 3301-201, it’s crucial to clean all mating surfaces and torque the bolts in a star pattern to avoid uneven stress. Regularly checking the face runout can prevent vibration issues that lead to premature wear. This part is not just a replacement; it’s a restoration of your driveline’s integrity.
- Counterbore depth: 0.421 inches
- Compatible with 3594-2000U or equivalent
- Ensure proper alignment to prevent vibration
- Check bolt torque in a star pattern during installation
- Inspect for wear regularly to maintain performance
