Merchant Automotive Transfer Case Speedometer Tone Wheel (49 Spline) - 2002-2007 GM Duramax 6.6L LB7/LLY/LBZ

Product Name: Merchant Automotive Transfer Case Speedometer Tone Wheel (49 Spline) - 2002-2007 GM Duramax 6.6L LB7/LLY/LBZ
Manufacturer: Merchant Automotive
Manufacturer Part #: 25902
Thoroughbred Diesel Part #: MAT25902
Fitment Notes: 2002-2007 GM Duramax 6.6L LB7/LLY/LBZ

This is a replacement rear output speed sensor tone wheel for GM transfer cases with a 49-spline mainshaft; NP261HD, NP263HD, NP261XHD and NP263XHD.

The speedometer in your vehicle receives signals created by the speed sensor’s magnetic pickup interacting with the peaks and valleys of the tone wheel to accurately indicate vehicle speed. If there is an issue in the speed sensing circuit it can cause the transmission to go into “limp” mode in an attempt to prevent additional damage.

Merchant Automotive Transfer Case Speedometer Tone Wheel Features:

• Direct Replacement Part: Fits NP261XHD and NP263XHD transfer cases with 49-spline mainshafts, used in GM Duramax models from 2001-2007.
• Precision Design: Ensures proper sealing to maintain optimal fluid levels and prevent leaks in the transfer case.
• Accurate Speedometer Readings: Ensures reliable speed data for accurate speedometer readings.
• Prevents Transmission Limp Mode: A faulty tone wheel can disrupt speed sensing, causing the transmission to enter "limp" mode as a protective measure. Replacing the tone wheel prevents these interruptions.
• For more information on Merchant Automotive call us at 1-859-737-4966

FAQ:

Which direction does the tone wheel face when installing it in the transfer case?

The tone wheel has a stepped edge on one side, be sure to position the wheel so that the stepped edge faces the transfer case pump.

Do I need to replace the speed sensor too?

If the tone wheel was damaged from making contact with the speed sensor both will need to be replaced. Carefully examine the speed sensor to verify if any contact has been made and if there has the sensor should be replaced.

What fluid should I use in the transfer case and how much is needed?

We recommend our Performance Transfer Case Fluid for use in ALL transfer cases and have seen improved performance over the factory recommended ATF or other alternate oil recommendations. Two-quarts are required to fill the NP261HD, NP263HD, NP261XHD and NP263XHD transfer cases.

I hear a grinding noise at low speed after reassembling the transfer case. What could that be?

A low speed grinding noise is most commonly caused by the rear output bearing snap ring not being fully seated causing the bearing to move out of proper alignment. Verify that the snap ring is fully engaged and properly seated in the rear housing and the locating groove in the bearing.

What would cause a speed sensor correlation code after reassembling the transfer case?

A speed sensor correlation code is often accompanied by a low speed grinding noise and is frequently caused by the rear output bearing snap ring not being fully seated causing the bearing to move out of proper alignment. Verify that the snap ring it fully engaged and properly seated in the rear housing and the locating groove in the bearing.