Merchant Automotive Transfer Case Speed Sensor O-ring, Duramax | 1998-2007
Due to daily fluctuating stock levels, please call (616) 772-9551 for time sensitive orders.
This O-ring seal is used to seal the speed sensor on the transfer case. The seal should be replaced each time the speed sensor is removed from the transfer case to prevent leaks. It is located along the tailshaft at around the 11 o'clock position.
NOTE: NP246 transfer cases use three speed sensors for automatic four wheel drive engagement so if you are servicing all three speed sensors you will need three O-ring seals.
Click here to view the Merchant Automotive Transfer Case Pump Upgrade kit.
Click here to view transfer case pump upgrade installation instructions.
Click here to view the Truck U segment on the Merchant Automotive Transfer Case Pump Upgrade.
My transfer case was dry or way less than 2 quarts of fluid came out when I drained it. My output shaft seals and the speed sensor seal look good and show no signs of leaking, what could be the problem?
With a 1998 through early-2007 transfer case, pump rub is the likely problem. Click here to view the Merchant Automotive video on pump rub and our permanent solution to the problem.
YEAR VEHICLE CHASSIS TRANSFER CASE MODEL NUMBER 1998-2007 SILVERADO/SIERRA 1500, 1500HD, 2500, 2500HD, 3500 NP246, NP261HD, NP263HD, NP261XHD, NP263XHD 1999-2007 ESCALADE - NP246 2002-2007 AVALANCHE 1500, 2500 NP246, NP263HD 1998-2007 SUBURBAN/YUKON XL
1500, 2500 NP246
2500HD 3500 Silverado Sierra 6.6L V8 Duramax Diesel
Engines: LB7, LLY, LBZ
Years: 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, early 2007