Gearbox noise


New Member
Hi guys.
I have a 2006 Nissan navara d22 ZD30
There is a unknown sound and I’ll describe it

in 3/4/5 gears, when lightly on the throttle there is alike grinding sound, gets a lot worse going 80+
This doesn’t happen in 1/2 gears, and doesn’t happen when clutch is applied or in N

I have put the transfur case in N and tested the gears like I’d drive normally - to there is no sound but hard to push into 4/5 gears

any help with this would be highly appreciated. Thanks everyone