'98 JGC 4.0

When I put my Jeep into drive & take my foot off the brake, it pulls forward as if I'm in 4Lo? This pulling keeps the Jeep steady on hills without using the brake. I

Any ideas on why this? I'm sure it's causing my brake pads to wear quicker than they should!

My JGC has done this since I bought it and it only has 89k miles. I figured it was just the nice torque. Considering my old car is a Honda, I wasn't really used to it... haha...