2008 4.7L Maintenance

So my brother bought a 2008 Tundra 4.7L 4WD and I started to do basically all the normal maintenance items on the truck as the previous owner that had it for 3 years did 0 upkeep on it and just drove it as a plow truck. Based on the VIN it was regularly serviced by Toyota before then and just had the frame recall done October 2019.

Just looking for input on some things I should do/check that I haven't done yet. Below is a list of the things I have done to it since he took possession of it.

Front and Rear Pads/Rotors
Parking Brake Shoes/Hardware
Lubed Parking Brake mechanism
LF Wheel Bearing(checked other 3)
Front Differential Oil(Mobil 1 75w90)
Rear Differential Oil(Mobil 1 75w90)
Transfer Case Oil(Mobil 1 75w90)
Transmission complete drain and fill(ran about 12 liters through it to make sure it was all fresh)(Valvoline)
Transmission Filter
Spark Plugs(Iridium)
Engine Air Filter
Cabin Air Filter
Recharged A/C
Freshed headlights(were turning yellow)
Engine Oil Change
Checked all engine bay fluids

It sucks that all of this had to be done but he only paid $15,000 for it with a plow and it only has 82,000 on it which in Maine is a steal. A dealership around here would be charging 20-25k with the plow. I have put roughly $800 in parts into it since I didn't cheap out on the parts and did all the work myself so no labor.

Anything else I should check or do on this thing?

 

Rough service. Grease drive shafts.

I have a 5.7 Sequoia, so may not be the same. Will need to get rear wheels off the ground to rotate the drive shaft for easier access to fittings. May have a guard at the transmission which needs to be removed to get to u-joint. Fittings on front shaft may be hard to access, a right angle adapter worked for me.

 

If it has electrical connectors at rear for towing, clean and apply dielectric grease. These are always neglected.