^ Exactly. Look at Magnuson Moss act
Any modification will NOT void a part's warranty unless the modified part caused failure/damage to said part.
So if your piston rings weld themselves to the cylinder liners, they can't blame it on your BB
If you put on a lift, and you blow driveshafts weekly, yeah, you're on your own
Just be smart, and take off the lift if you ever have issues with driveshafts/U-joints, etc.