Outer Limits 4x4 Board

hi guys iv got a gq iv jus installed marks crawler gears 43% and there is a whining nosie in 2wd manly in 3rd 4th 5th gear jus wondering if its nomral for them to do it

There shouldn't be any noise as they aren't supposed to touch the High range only low range gears. In 2WD its high range so the low range should be doing nothing