[KShortell]

I took the truck over to the USCG base today and put it up on a lift at the hobby shop. 85W-140 did the trick. It's hardly detectable now. I actually hadn't seen the insides of the differential in over a decade. The fill plug was stuck last time, so I've had someone do the rear end lube for me.

The good news is that the fluid was still pretty clean. There's a mirror polish on the teeth, so it's just normal wear after 145,000+ miles.

I switched the engine over to 15W-40 since it doesn't get below 10F here and GM says that 15W-40 is good for that heat range. Oil pressure is better on the highway now.

I was so motivated today that I even replaced a bad power window motor on the front passenger side and replaced the dash bezel decal (brushed aluminum) as well. Now, she's just needs a buff and wax...

I will say that doing the differential up on a lift is SO much nicer that doing it in the driveway. I know that my back will thank me tomorrow!

Thanks for the input. It's a boost of confidence in any event.