Kirkham rear differential query

[Dimis]

Originally Posted by dcdoug

My understanding is that the port on top of the diff is for an diff cooler and should be blocked off if you aren't planning to run one.

The primary vent is the one that comes off of the pumpkin cover and probably has some mesh, etc on the inside to keep fluid from splashing out of the vent.

Can anyone confirm which is right?

EDIT: By the way, Kirkham says to run 90w gear oil with no friction modifier.

Thanks dcdoug,
Top vent has been plugged, and diff has been installed.

As for diff oil.... well, its a little contentious but...

From my notes as per Kirkham's old webpage:

WARNING: The differential covers that we use locate the drain plug approximately an inch higher. Do NOT fill the differential to the drain plug (Refer to the yellow marked line in my pic).

3.25 pints 85W90: GJ-6. Mobil + 4 oz Friction modifier.

For Auburn use Auburn part number: 504102
For Dana use Ford Friction modifier (ford part number M-195-46-A12) old petroleum based NOT Synthetic.



As per Morris's experience and testing - (I quote him from the notes I've taken). The oil that should be used is Mobil 1 75W140. This is the best oil we have tested and reduced our temp by 40-60*degrees. Way better then all other products

I haven't found anyone that imports the Mobil1 stuff here to Aus at a cost effective price, so I've opted to use Nulon 85W140, its an Aussie product that is the equal as the Mobil 1, as I've been advised.

Kind regards