Thread: Transfer Case Oil additives - Yes or No?

Not too sure of the model but it's the one behind the 91 3.9 litre with a fluid coupling.
Recommended lubricant is Dexron TQ II or equivalent, or even better?
It's been a while since having a Rangie, in fact the last one had a Transfer case with Straight cut gears and a 3rd Diff. A real noisy sucker to say the least. I think I must have tried every additive on the market to try to improve the operation of this box.
The later 1991 series is a whole new ball game and is quite a smooth and quiet item however some noise and fine high pitch vibration can be noticed at 110 KPH.
Have checked the Drive Flage centre nuts and all are tight. Prop sgats are good and no wear is apparent in the universals or slip joints.
When this noise becomes eveident some fine vibration can be felt in the Transfer Case Gear stick and I am suspect of the O/P Shaft bearing to the front Prop Shaft.
Maybe some additive may help? I have no idea......
Any sugestions please, I am in the dark with this model.
Cheers,
Shirley.....