Only K&Ns I use are the black ones, without the stupid leaky, rust prone nut. From when WM had them on clearance for $4! And they are silicone ADBV Ecores, but they may not be any more.
Fan belt looks loose. Any lube on that giant chain is flying off in a hurry too! Figures it would have 2 water pumps, Ford is a company that thought 3 electric fuel pumps would be a smart move (twin tank F series)!
That's the old Mopar Castrol Syntorq 75W85, not sure if it is available any more or not? I'm a big fan of Red Line MT-90 & MT-85 (which is 75W85)-but IIRC the GM NV4500 lube is still available, PN 12346190. I'm not sure MTF has made huge advances since the '90s.
If anyone on the east side of Cincinnati needs some filters, there's 5 FL-400Ss for 99 cents each, and a sizable collection of cartridge filters too, at the Eastgate Meijer. I have enough, but they're still out there, dirt cheap.
It's been checked recently and the color is still normal, been about 25K miles now. The 10R80 is the "Linda Blair" of transmissions-they literally act like they're possessed. The colder they are, and the more they're babied, the worse they act. Get them hot & take the whip to them, they get...
I had a 4L80E tear out the OD sprag around 120K (stupid company getting 3.08 rear axle ratio on a work van did that). Our 6L90s have been OK so far... (knocking on wood)
The 10R80 in the '21 in my sig had a fluid flush at 60K (had to be done at the stealer with a heated flush machine, ATF was BLACK), didn't help it a bit. We had one down for 4 months, couldn't get the parts for it, now mine is getting worse at 85K, and we have several others going at under 100K...
I could be convinced to buy a Bolt EUV-sell the aging xB, put a solar array up to charge it, use it for short trips around town. But, the bus would sure be cheaper!