Montana Skies

I called a local Chevrolet dealer and spoke to the parts counter employee. He looked up the truck (2020 Chevy 3500 HD with diesel, etc.) and said his documentation does not list the rear axle or front axle fluid capacity. His documentation did list certain other fluid capacities such as engine oil, transmission, etc. Don't know why his info didn't list capacity for axles. Regardless, he advised when he changes his own gear oil in his rear axle (on an older vehicle), he adds sufficient fluid that he can put the last digit of his little finger in the rear axle lubricant fill hole and if he can touch the new fluid, he considers it done in terms of the fill level. That's the rule of thumb I've heard service personnel say, also. When I get around to changing my rear differential gear oil on my 2020 3500HD diesel with limited slip, I plan to buy 4 quarts of the appropriate viscosity gear oil and, after draining the "old" fluid and reinstalling the drain plug to add my new fluid until I can touch the new fluid as noted above. Then, I will add 4 ounces of limited slip additive that I'll buy either at the Chevy dealer or I may buy the AMSOIL limited slip product. Using this technique, worst case is I have some extra gear oil to use when I change the gear oil in a second truck I have.

For the 2020 Chevrolet 3500 HD with the duramax diesel, the rear differential capacity is 6.3 pints. FYI, for this same vehicle, the capacity for the front differential for trucks with 4 wheel drive is 3.8 pints. This capacity information was found on the AMSOIL web site. When I change the fluid in my truck's real limited slip differential, I also plan to add some limited slip friction modifier.

I'm new to this forum and am respectfully requesting some help. For a 2020 Chevrolet Silverado 3500HD with the 6.6 liter Duramax diesel engine and the Allison branded 10 speed transmission 10L1000, does anyone have a factory torque spec for the 16 bolts that fasten the transmission oil pan to the transmission case?