So am I correct that many of us don't bother changing the oil in both the rear end and tranny on a regular basis? Like almost never?
Craig -- Just to add a "harrumph" to what Jerry said ... When I was working for my friend Pat (part time until I retired and then for 4.5 years after I retired driving tractor trailers and dump trucks ... On the heavytrucks (Peterbilt road tractors and triaxle dump trucks), we'd change the engine oil annually and check the transmission and axles. I'd stick a finger in the check hole and f there was brown or black oil on my finger, I'd put the plug back in and mark it "Good." If I didn;t get any oil on my finger, I'd top it off. If I got milky brown oil on my finger, I'd change it.
