Reddit reviews Manual Locking Hubs 31 Spline 90mm Free Wheeling Hub Lock Fits For GQ GU Patrol
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1~PCS Brand NEW FRONT FREE WHEELING HUBS LOCKGear Spline Teeth: 31~SplineThis Wheel Hub Lock is a Manual Hub LockPCD : 90mm. Auto to Manual hub conversion
Since you said that you have new tires and did all the necessary balancing, what comes to mind is a bent front drive shaft or loose joints, this can cause vibration, its a common problem with old Nissan Patrols and the current Y61. A quick and cheap fix that would also reduce fuel consumption is installing free wheel hubs.
https://www.amazon.com/Nissan-Patrol-Locking-Wheeling-Maverick/dp/B017YHU0E2
You can find factory original ones as well. These are installed on the front wheels and when they are free they disengage the front diff and keeps the front drive shaft stationary. The down side is that you can not switch to 4 wheel drive unless you go to each wheel and lock them.
There are some automatic ones but you have to reverse to lock then engag 4 wheel drive.