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Old 12-20-2019, 10:30 AM   #5 (permalink)
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Join Date: Jun 2016
Location: MI.
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Originally Posted by sgaston View Post
I'm the original owner of a 2007 2500HD Classic 4WD with 65K miles. All other maintenance has been kept up to date, but I haven't replaced the differential and transfer case oil. Should this be done soon? If so, should I use a synthetic for longevity?
First welcome to DP

I’m still the Original Owner of our 07 Classic for another month and I have all the Owners Manuals including Diesel Supplement Manual.
6-14 Page 550 of your Owners Manual
Front & Rear Axle
SAE 75W-90 Synthetic
Axle Lubricant
(GM Part No. U.S. 12378261, in Canada 10953455) meeting GM Specification 9986115.

Yes, I would use Synthetic of your choice since it recommended.

This might help
As for the transfer case I filled through the top fill not the speed sensor that some recommended. I figured it wasn’t necessary.

There is a debate on what oil to use in your transfer case on here. If you want me to find it I can or you can do a search

Last edited by Rvn4me; 12-20-2019 at 10:35 AM.
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