89 Pickup - Does it have ABS??
 

I've heard that the 89's have rear ABS, only when in 2wd. Is this true? How do I check to see if I have it? When I bought the truck, all of the guts for the rear adjusters were missing. Could this be because someone didn't like having ABS and decided to get rid of it? Thanks guys.

Turn on the key and see if the ABS light comes on is one way (assuming the bulb isn't burned out...)

Look inside the RF fenderwell, below the battery, on top of the frame rail. If you have RW ABS there will be a device there with a bunch of brake lines and other lines going in and out of it.