In my previous inquiry, I noted I have 35K miles on my Envoy in the last 12 years since I changed all the fluids. How do the differential (front and rear)hold up over time? Or is it mainly a mileage related condition? Thanks for any input. c good
When you hit 50k - the recommended interval for the transfer case fluid - you should replace the differential oil. Not absolutely essential, but good preventative maintenance.