Outer Limits 4x4 Board

I have a 4 spd manual rangie, I have already replaced the rear diff, and now I will have to get some sort of shimes in the transfer case replaced to stop her from sometimes poppoing out of low range. The front has lots of backlash. Is this normal, and is it very damaging to the rest of the drivetrain ,when 4wdriving. Does anyone else have this problem, is it a range rover problem

my 94 disco does the same thing but does not jump out of gear all the places i have rung have told me that the output shafts in the transfer case wear and is normal and they all say let it develop