Gl ML R clicking knocking pinging fix under acceleration [chain replacement] (easy)

Chain I used: Transfer Case Chain Morse Chain for Mercedes ML & GL & R Series 2003-2010 Transfer Case (HV-091) https://www.amazon.com/dp/B07GJHWP3G/...

Fluid spec sheet: https://bevo.mercedes-benz.com/bevoli...

While this tutorial is being done on a 2011 Gl 550 the same transfer case has been used on many other MB vehicles.
Mercedes ML - GL - R Series 2003-On 2003-On W163 & 2005-On W164
ML320 '03, '07-'09
ML350 '03-'11
ML450 '10-'11
ML500 '03-'07
ML550 '08-'11
ML55 (AMG) '03
ML63 (AMG) '07+
X164 GL CLASS 2006-2012:
GL320 '06-'12
GL350 '06-'12
GL450 '06-'12
GL550 '06-'12
W251 R CLASS: R320, R350, & R550 207-2011
Mercedes-Benz GL-Class X164
Mercedes-Benz M-Class 166
Mercedes-Benz M-Class W164
Mercedes-Benz M-Class W166
Mercedes-Benz R-Class W251, V251