what does it mean when your truck starts to lock up when you're turnin with an 2000 lincoln navigator?

Answer 1

Is that all-wheel-drive? You might have some binding going on. There's should always be some friction in a turn from the viscous transfer case but if it's really binding up, it might be worth checking out out that transfer case. Friction-type cases are sensitive to the fluid that's in them...it might be worth changing the fluid inside.

Answer 2

It will do this on dry pavement if in 4hi or 4lo. If you switch to 2wd or Auto it should work better.