you have to lock the trans. Otherwise power will only go to the axle with the least traction. Like if it has enough power to pull a wheelie, as soon as the front tires leave the ground, the rear will loose all the power. And if you have open diffs in the axles, all it will take is 1 tire to leave the ground and the other 3 will be dead as the one in the air will get the pull brunt of the motor. You will hate it.
So at the minimum, lock the trans.
It's not hard to lock up a pede. It's really no different than locking an axle. Just take it apart, the take apart the diff it'self. There is a number of things you can do to lock it, most common is JB Weld, but that is perminate. I personally use hot glue. Have not had a failure of the "glue locker" yet either. But you need to really clean out the diff and degrease it so it is bare clean metal. (so ya, I guess i did have 1 failure, but that was cause it wasn't done right the first time)
The first time I locked it, I left most the grease in, just took aout the majority but everything was still coated. The "glue locker" failed with in the first pack or 2. Thats when I cleaned everything really good and did it again. Been holding for a few years now.