If my memory is right on the name of the trail, I ran Bull Park last summer in an 1986 IFS 4Runner with a front locker and while it made it ok it was one of the least enjoyable times I've ever had in that vehicle. Lurching and bumping the whole way over a rocky trail . My wife and kids got out and walked because they were so fed up with getting thrown all over the place (in fact, I would have gotten out and walked if anyone else would have driven the truck). I might do again in my solid axle truck but not in the IFS one.