Transfer Case 4x4 Actuator- Replaces# 12474401, 600-901, 711012, 600901 - Fits 99 Chevy Blazer, Silverado, Suburban, Tahoe, S10, GMC Jimmy 2000, Sierra, Sonoma, Yukon & more - 4WD Shift Encoder MotorCategory: Chevy Gmc Truck Suburban BlazerThe 4WD transfer case attaches to your truck's transmission and allows you to easily change between rear-wheel drive and four wheel drive, 4x4. The transfer case consists of a series of gears and chains and when switched over allows power to be transferred to the front wheels and rear wheels at the same time. In order for the transfer case to switch into four wheel drive, 4x4 mode a gear must be turned inside the transfer case. Please verify that your transfer case encoder motor has the square connector plug with 4 pins Fits vehicles with NVG136, 236, 246 RPO Code NP8 transfer case: 1999, 2000, 2002 Cadillac Escalade 2002 Cadillac Escalade EXT 2002 Chevrolet Avalanche 1500, 2500 1998-2005 Chevrolet Blazer 1998-1999 Chevrolet K1500, K1500 Suburban, K2500, K2500 Suburban 1998-2004 Chevrolet S10 1999-2002 Chevrolet Silverado 1500 2001-2002 Chevrolet Silverado 1500 HD 6.0L 1999-2002 Chevrolet Silverado 2500 2001-2002 Chevrolet Silverado 2500 HD 6.0L, 6.6L, 8.1L 2001-2002 Chevrolet Silverado 3500 2000-2002 Chevrolet Suburban 1500, 2500 1998-2002 Chevrolet Tahoe 1998-2001 GMC Jimmy 1998-1999 GMC K1500, K1500 Suburban, K2500, K2500 Suburban 1999-2002 GMC Sierra 1500 2001-2002 GMC Sierra 1500 HD 6.0L 1999-2002 GMC Sierra 2500 2001-2002 GMC Sierra 2500 HD 6.0L, 6.6L, 8.1L 2001-2002 GMC Sierra 3500 1998-2004 GMC Sonoma 1998-2002 GMC Yukon 2000-2002 GMC Yukon XL 1500, 2500 Replaces part numbers: 12474401, 600-901, 711012, 600901 This is a compatible replacement part manufactured by AA Ignition. This 4WD Actuator is NOT a genuine GM or Dorman part. GM and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this 4WD actuator fits.