While driving onto the highway vehical 4wd service light came on with loss of power like the transmission or ptu was in natural motor rpms came up without power to the wheels trying to merge ptu engaged with a loud clunk and jerk then started to make a clicking noise 10 miles after. Replaced cv axles and replacing drive shaft. Finding out the ptu needs to be replaced due to a faulty clip that caused worn splines loss of traction causing further unsafe driving issues. Having the vehical brought to the dealership.