90w or even 140w in front axle to slow leak?

[SPYDERLK]

If those seals leak to where no oil is at that level, your ring and pinion will be toast. The oil doesn't run back and forth once it is down to those seals like it does in a car or truck axle.

Possible those seals are lower on a NH. On my 3 Kubotas its high enuf that the wheel spindles still share some of their oil in tractor type [bumpy] work. The dip in the pumpkin catches some and thus remains ok for a while in no load conditions. How long a while is is years so far. More that 2000 hrs tractor use. Sparing use of 4wd except when it has been recently filled.
larry

 

[arrabil]

In response to the original question, it is highly unlikely that the heavier weight oil will prevent leakage if the leak is already that bad.

 

[dqdave1]

Change the seals.

 

[Soundguy]

I know it's been said already.. but check the bearings while you have it down.. while seals do fail all by themselves, .. seal failure can point to a bearing with excessive play.. etc. don't want to change seals and have then go out again fast..

soundguy