Sorry. It's a 97 reg cab w/ full bed.
Also, I should checked back posts first. I found a thread "2 or 4 Wheel ABS" started this past February. In it, danny owens suggested locating a "rectangular aluminum block directly below your master cylinder with 1 line going in and 1 line going down and to the rear brakes. (RABS)."
I've just check under my hood and found two lines exiting the master cylinder; one going to the front wheels, the other going to the aluminum block below the master cylinder.
Only one line exits this aluminum block and routes toward the rear wheels.
I'm concluding I have RABS.