For an axle that was offered as an option for a number of years, the Timken axle still is a mystery.

On the driver side of the clamshell differential, there is a vent. I suspect the vent is supposed to be spring loaded to allow pressure to vent out of the gearbox to keep from blowing oil out through the oil seals out on the end of the axles.

But - on my Timken axle vent, the spring in the vent has ceased to be a spring and it has turned the vent into an oil geyser. The truck is piddling on the floor - not a good condition.

I've found no reference to a vent for the Timken axle, original W-O part number 644089.

The vent for my axle threads into the axle housing with a tapered thread.

But, there is a vent for a Dana front differential:

https://www.kaiserwillys.com/front-d...ith-dana-25-27

This seems to be a straight thread. What are the threads for this vent, 1/8 NPT?

I may take this vent and use the spring out of it to rebuild my vent. Desperate times demand desperate measures...