I just went over 9000 miles so it's time to think about changing out both differentials and the transfer case. I'm thinking about going with Mobil 1 Synthetic since I've had great luck with it in the past but since the demands on my 1 ton will be more severe on the drivetrain then the 1/2 tons I've owned in the past I was wondering if any of you vetern Heavy Duty owners knew something I don't and had different recommendations?

Thanks!

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10