when I start my truck the 4wd indicator light will be in 4 hi 4 low or even neutral, replaced switch and did not cure the problem

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I have replaced the switch and the actuator and still when I start my truck the 4wd indicator light will be in any spot it chooses, if it starts off in 4 low it will effect the trucks performance when taking off, pull over shut truck off wait a few minutes and restart and the indicator light could go back to normal or choose neutral or 4 hi. Also when driving down the road everything working fine, I will get this noise as if you hit the rumble strip on the side of the road, take ur foot off the accelerator and reapply and the noise goes away, this will normally happen in between 55 and 65, dont know if this has anything to do with my 4wd system