AP02 Transfer Case Assembly A2512802100 2512802900 for X164 W164 W251 GL420 ML320 ML350 R350 Before installation, ensure gear oil is added to the transfer case. Using the correct gear oil type (75W-90) in the proper amount is critical for performance and longevity. OEM Part Numbers: 2512800700 2512800900 2512801200 2512801800 2512802100 2512802700 2512802900 2512803500 A2512800700 A2512800900 A2512801200 A2512801800 A2512802100 A2512802700 A2512802900 A2512803500 Fits Models: GL-Class GL 320 (2006-2012) GL-Class GL 350 (2009-2016) GL-Class GL 420 (2006-2009) GL-Class GL 450 (2006-2012) GL-Class GL 500 (2006-2016) M-Class ML 320 (2005-2011) M-Class ML 350 (2005-2015) M-Class ML 420 (2006-2009) M-Class ML 500 (2005-2015) R-Class R 350 (2006-2016) Verify vehicle compatibility before purchase. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.