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I'm assuming its auto, so will reply as if it is

Could be many things wrong.

Worn clutch plates

Stuck solenoid

Has it ever been serviced other than just an oil change?

Have you changed the transmission fluid?
Do that first

hey guys fairly new to the 4x4 scene, i am looking to buy a GQ and throw some money into it. I have found a Nissan Safari (which to my knowledge is the only GQ factory turbo 4.2). what I am wondering...

Could be a range of things and is a matter of elimination.

I assume you mean the torque converter isn't locking?

I have also moved your thread into the gearbox section.