I got alot done today. Actually, yesterday and today.
Yesterday: replaced the battery, installed an EverStart MAXX-H6. The old battery tested good, but I had no idea of its age. I sucked out the PS reservoir and refilled it with Lubegard 23232 synthetic PS fluid and 4oz of SeaFoam HydraTrans-Tune. I like it for helping to clean out sludge and such.
Today: refilled the front differential with Mobil 1 Synthetic 75W-90LS gear oil and refilled the AWD transfer case with ACDelco Dexron-VI full synthetic ATF 88865618.
I removed the cover from the rear differential to drain the fluid. It did not look bad at all. It was the color of old gear oil, with no real fuzz on the magnetic fill plug or on the magnet inside the cover. I did get a look at the G80 locker in the rear differential. I am going to have to educate myself on how a locker works vs an LSD. Glad I have it, though.
As for the rear axle, I am not 100% sure, but I am pretty sure it is the 8.625" diameter ring gear unit. I can't figure out which RPO code is for the axle itself. However, my circumstantial evidence:
RPO C6C: GVW rating - 7400 lbs
10 bolt differential cover with reusable rubber/steel gasket
No drain plug at the bottom ( only 9.25" axles get that.)
Soo... that is what I think.
Anyway, it is full of fresh Mobil 1 Synthetic 75W-90 LS gear oil.
I flushed the brake hydraulic system with DOT4 fluid, starting by sucking out the master cylinder reservoir. I then refilled the reservoir with fresh DOT4, then connected my Motive bleeder. Never flush without it!
It was not smooth sailing, though. The right rear caliper bleeder screw was VERY tight. Like I was only able to crack it enough to slowly bleed. I was wary of it snapping off. I let that corner bleed for a long time. The fluid started out brownish, and improved some over time. It needs to flush more at that corner. I will do so when I clean and inspect the brakes.
The left rear caliper bleeder screw was tight, but I was able to open it smoothly. The fluid started out very dark, but not black. It eventually cleaned up, mostly. Again, I will flush it again when I clean and inspect the brakes.
Both front caliper's bleeder screws opened smoothly and bled well. Both fluid started out brownish, but quickly cleaned up. Both of those bled to clean fluid.
Fun fact: I was able to acces all four bleeder screws from under the SUV with the wheels still on. I have never dealt with 22" rims before...
New battery install.
PS fluid change.
Front differential fluid change. I put a bit of oil on the fill plug to slow the rust.
AWD transfer case fluid change.
Rear differential fluid change.
Now...I did run into what may be my first real issue with this SUV. I think the front differential left side axle bearing is loose.
I have started a separate thread on it in the engine/drivetrain section:
https://www.tahoeyukonforum.com/thr...erential-left-side-axle-bearing-loose.129896/
All in all, I am VERY happy with my Escalade!
Oh, I forgot to mention, this thing is CLEAN underneath!!! NO RUST!!! That matters, because my Explorer was slowly dissolving before my eyes.
Thanks!