It's probably best to leave it in 4 wheel drive. I wouldn't want to take a chance of breaking traction. If it does, you may take a ride you don't want to. A lot also depends on what tires you have and the conditions of the ground. Grass covered,dirt,wet,dry,snow,dew,ect....... all play a factor in traction. I have an JD 870 with R1's that I run in 2 wheel drive every once in awhile. I also have a JD 3520 with R4's that I immediately put in 4 wheel drive as soon as I leave my level yard. I think the R4's break traction very easily. Good luck and be safe. If you think you should be in 4 wheel drive, you probably should be.