If the leak is happening while the carrier's been standing, it can't be coming out the main shaft unless you've overfilled the case. The oil level should be below the centreline of the shaft. The other places for oil to get into the bellhousing area are the countershaft and the threaded holes for the bolts that hold on the front bearing retainer. The countershaft should be a tight fit and leak free and of course the bolts should be done up tight.
There is no oil seal in the front mainshaft, only a return drainage hole for any oil that should seep past the bearing. When installing the gasket, you should take care not to cover over the drain hole. It's not a factory fit on these gearboxes, but Jeeps also use a felt wick that should retain any excess seepage and return it to the drain hole.
When these gearboxes were designed, the bearings were plain roller bearings. With the choices available today, fitting a bearing with an outer seal will greatly reduce the amount of oil that gets past the bearing.
Now, of course, you ARE sure it is gear oil and not engine oil that's leaking?
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