And imo id go through everything. Check for rust. Rust and rust.
If the track bars are on still take them off. If it has been lifted are the brake lines relocated/extended? If not you dont want a brake line becomeing a limiting strap. It wont last long.
Planning on going to 35s you will need to do a rear axle swap. Ford 8.8 is popular there are many wright ups on here about it.
Im not sure about gearing have not delt with that at all...
I have 30 inch tires and 4.10 gearing on the flats i can roll 80.
uphill is slow.
I think some people go to 4.88?
5.13 i have seen on crawler rigs
Or am i going the wrong direction