HEAVY DUTY OIL STABILIZER

There are no planetary gears. The Fairey overdrive is a simple, conventional two speed gearbox with an input shaft, a layshaft and an output shaft, the only thing out of ordinary with it is that the output shaft is a quill shaft coaxial with the input shaft.

The oil level for the Fairey is well above the oil level for the transfer case, so that having a common oil system would mean either a higher oil level in the T/C, with the probability of leaks, or an oil pump. I have read of suggestions for enlarging the sump on the overdrive to simply get more oil in the system, but it is not simple to do so.

Moreys is brilliant for steering boxes and swivel housings.
Oops still leaking, now I'm using Moreys grease in my steering box.

The best fix for a Fairly Overdrive is to replace it with a Global Roamerdrive. $2000 well spent.

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The oil level for the Fairey is well above the oil level for the transfer case, so that having a common oil system would mean either a higher oil level in the T/C, with the probability of leaks, or an oil pump

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Well AFAIR the LT95 Fairey had a scoop at the top and a drain into the LT95 at the correct level.

The splashes from the spinning shafts would be collected by the scoop and excess drain out back into the LT95.
This is also the way the LT95 intermediate shaft was lubricated.

To fill them you would fill the transfer box and leave the filler plug open, then fill the Fairey until more oil came out of the LT95 filler plug. The oil splash from the spinning shafts would then feed the Fairey and the excess would drain back into the LT95.
So no higher oil level was required. I still have my hose with a 0.5MM restrictor to equalize the gearbox and Transfer. I cannot remember now accurately but I think the transfer oil used to migrate to the gearbox and the drain would let it run back down when the gearbox became over full. Further proof that there was lots of oil splashing around in there.
Regards Philip A

That would be rather difficult to arrange for the series - the quill shaft where it goes into the casing is almost the full diameter of the hole in the T/C - not much room for a scoop and drain. Should work if there is room for them, but from memory the hole in the back of the LT95 is much bigger than the one in the Series T/C.

the Roamer drive has a spiral on the outside of the output shaft behind the output gear that sucks the TC oil into the overdrive unit , it drains out holes back into the TC , very simple really. I think you could do similar on the fairey.