Back in the days when he ran a Land Rover authorized warrenty repair shop, he recieved a bulliton from Land Rover saying not to park Land Rovers facing down a steep hill.
The primary input shaft on the front of the transmission does not have a regular oil seal. It instead has scrolling that activly pushes the oil back into the gear box when the Land Rover is tilted downward enough that the transmission oil level reaches the input shaft. This works well when the Land Rover is moving but does not work when the car is parked.
Transmission oil will flow down along the shaft and go onto the clutch disk. Left facing a steep downhill long enough, the clutch can start slipping. The heat of the clutch will dry the oil and create a glaze that causes clutch jidder.
He mentioned that a few clutch disks were replaced on warrentee because people parked regularly facing down hill on some of the San Francisco hills.
I believe he said that the problem occures when the slope gets to be about 25 or 30 degrees. so a slight downhill slope is OK.
If you park on a steep slope always aim the nose of your Land Rover uphill.
TeriAnn Wakeman, twakeman@apple.com
Craig Murray (craigp@ocs.cpsg.com.au) says this is correct, but only applies to pre D suffix IIA gear boxes I think, I know that my F suffix gear box does not suffer this problem, that is why I have put that in my series 1 instead of the original box, after I blew it up, but I will miss the dipstick.