I got the 4 wheel ABS on my 1500. No 4 wheel disc though, unfortunately. Anti lock works well on the front wheels, can't recall ever feeling it kick in on the rears. I hardly ever have enough weight in the rear to test it though. I imagine it's much easier to lock up the rears with a vehicle that is grossly forward-weighted.

2001 model built in June 2000.

 

My apologies, got the 4 wheel disc and 4 wheel ABS info a little mixed up.

 

I have felt my rear wheel abs kick in once in complety dry weather taking a 90 degree turn at 40 scared the **** of the person at the light while I was surprized it worked