What kind of transfer case fluid is needed for a 2004 Chevy silverado 1500 5.3l 4wd?

The 2004 Chevy Silverado 1500 5.3L 4WD with the NP241 transfer case requires GM part number 12345345 (or equivalent synthetic ATF). While some sources might suggest ATF+4, GM specifically recommends a synthetic ATF. Using a fluid specifically designed for this transfer case is crucial for its longevity. Always check your owner's manual for the most accurate information, but synthetic ATF is the generally accepted recommendation.