Hey guys I have a 15 850 sp and it’s stuck in 4×4. I just put 4 new highlifter axles in it. Everything is stock except snorkels and 30 inch ag tires. In L and H it’s stuck In diff lock even with the switch in 2 wheel drive. In reverse 4×4 doest work at all even with switch in 4×4. I unplugged switch and still have the same problem. What could be causing this?