I purchased this LX450 (Lexus Landcruiser) and it was 100% stock. Two previous owners and Clean Title and Carfax. Below is a list of most of the things that I've replaced. Preventative Maintenance has been performed to almost an OCD level and I have all documentation for it.  Recently did $4k service. Motor runs extremely smooth and is very quiet and it has buttery smooth shifts. All electronics work, window motors are good, and no "my wife is gonna kill me" lights are lit up in the dash. Save yourself the headache, blood, sweat, and cheddar by going this route. All of this peace of mind cost me close to $10k. I also have most of the receipts and service on all of this. This is not triple locked (I was going to go with the ARB Locker route since it's better, but haven't gotten to it. I did install an OEM switch in order to turn the center diff lock on in 4H)
The Good:
We have replaced:
95% of all rubber hoses (OEM)
All Seals Replaced (OEM)
Windshield and Windshield Seal Replaced (OEM)
Air Intake (OEM)
AC/Heater Completely Replaced (Denso)
OEM Thermostat
Koyorad Radiator
Red Head Steering Gear Rebuild with 105 Series Shaft (Bullet Proof)
Oil Pump and Valve Cover Gasket
Knuckles and Knuckle Reseal Kit (OEM)
Coolant and All Other Fluids Flushed
Modified OEM Toyota Blue Fan Clutch (Keeps the motor nice and cool)
Complete OEM Belt Kit
OEM Bushings- Sway Bar, Upper and Lower Control Arms
Brand New Battery- Die Hard AGM with SDHQ Built Billet Battery Terminal Upgrade Kit.
Things that I smooth talked my wife into letting me buy:
Full 3 inch Dobinsons Suspension Kit
Landtank Caster Plates
Slee Rear Bumper
ARB Front Bumper
ARB Front and Rear Diff Breather
Bowfin Cruisers Full Roof Rack
Smittybilt Winch
35" Yokohama Geolander MT's (90% tread and rotated every 3k miles)
Recaro Specialist M Seat- Black Leather/Black Artista (Drivers Seat)
Sound Deadening in all Doors
Delta Center Console and Shift Console
CB radio
Pioneer Headunit with Android Auto/Carplay
Full Pioneer audio system with Sub
Front and Rear Camera
Window Tint and Windshield Tint
Lightbar
The little projects that I left for you to do so you can tell all of your friends that you built this thing up with all of that impressive brawn:
Passenger seat, Drivers Side Sun Visor, the exhaust needs to be replaced, and there's a scratch on the hood.