Finished up tonight under the truck by doing the transmission fluid. I opted for now not to do the filter as I figured I would see how the fluid looked. To my surprise, it looked/smelled like it was fairly new. It looks like the pan has been off, so I figure it had a filter change recently. I was thinking about doing the fluid again soon, but maybe not as it looked good. Any thoughts on doing a second go plus the filter? I think they did it with a bunch of other stuff about 5K ago, so 2 changed in 5K sounds decent to me.
For the diffs, the oil in the front one looked pretty new as well. Original color for the most part. The transfer case was darker, and the rear diff looked to be the darkest. For those, would anyone recommend a second fill? FWIW, I used M1 75w90, and went through 6 qts between the 3 of them.
Finally, I checked all the u-joints and drive shafts. There was not one millimeter of play in any of them. I'm not sure if they are original or not. Any good ways to tell? Was there a brand name on the originals? Also, I did not grease anything yet. I did see the grease nipples on the rear shaft but that was all I saw. Any better grease to use?
Thanks!

 

By the way, here is the trans fluid as it was coming out for a color reference.

 

Your trans fluid looked about about the same shade as mine, dark cranberry. I'm at 95k and had it changed at 60k with filter change.

 

The critical part about the front drive shaft is to check if EACH u joint has a grease nipple.

 

No, I don't think they were replaced with the serviceable unit if they were replaced at all. I'm just trying to figure out if they are the original ones or not. Any tips on greasing the rear one?

 

Greasing the rear drive shaft should be pretty easy.

Just grease the u-Joint then follow that by greasing the shaft's slip joint. To grease the slip joint, unscrew the plug in the DS near the joint, insert a zerk, grease the slip joint, then remove the zerk, and replace the plug.

 

Put the grease gun on the grease nipples and pump until grease comes out at all 4 corners of the u joint, grease the slip joint until grease comes out at the rubber sleeve. Do the same on the front shaft where you can grease it.

 

GKN's the oem on the drive parts. It's amazing how much cleaning the Mo1 does. If it were me, I'd change it out again on the next oil change to get the crud out the Mo1 removed. Is it necessary? no. but I always err on the side of overkill.

 

I too don't mind a few extra bucks an an hour of time for prevention.

 

Any preferred grease you use? I need to see what I have in the gun now. It is what I use for the snowblower auger but it was automotive.