dodge guy wrote:
At 100k I would do the trans, rear diff, brake fluid, coolant, and maybe P/S fluid. Fluids are cheap compared to a rebuild and sitting on the side of the road.
I do similar at 100K, nice starting over point. However trans likely would have also been done at 50K or less, brake fluid every 2 years, PS fluid likewise. Coolant, every 3 years or so.
GM specifies a specific rear axle lube for the eaton autolocker on the duramax. Commonly known as "grape juice" because that's what it smells like.
For the transmission I'd recomend using Transynd not DexVI. As long as your changing it, why not go for something far superior to DexVI.
Several mfg have Transynd TS-295 certified fluids.
Often the rear diff/transfer case/front diff don't have a change interval specified. doing it at 100K is IMHO a good idea.
And check the brakes, new shocks?