My current '11 Silverado 1500 has absolutely no listing for differential nor auto trans oil/filter changes in the owner's manual. I do know that the fluid in both is either semi or full synthetic.
The 1500 Dodge trucks I have owned prior to this made mention at 100k to change both in the tranny, no mention of diff.
So, having lived through many 10's of iterations of having the mess of getting the pan off, making the filter change, and getting the pan sealed again, I said XXXX with it.
I have an orange/black topped suction pump I bought from Autozone for $10 and every time I changed my engine oil I would run the suction hose down the dip stick tube and suck out all the fluid I could get....between 1 and 2 qts. I carefully measured what got out and replaced with ATF+4 which I know has synthetic oil in it. Every bit I got out I analyzed for condition of oil and it was usually pretty clear with no burnt smell. I pull a boat and stock trailers occasionally.
I will probably never change those fluids in this truck and probably die before I put 100k on it.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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