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Not sure if this discoloration is normal between the teeth on pinion gear? Truck didn't seem to be shifting properly pulling 28ft toy hauler on big hills. Trans temp always seemed normal. Just changed the rear differential oil at 17000 miles with AMS Severe Gear 75-90 and seems to be shifting...
When I decelerate in 4th gear dropping my RPM’s to 1900 my engine hesitates or pulses. I can hear the drive shaft banging like I’m popping the clutch in and out. It goes away if I take my foot off the diesel or step on it. I think it happens in other gears as well. Any ideas on my engine...