Moser 9" and rear pinion seal...

[69Pony]

Those who have the Moser 9" rear - what is your experiences with the rear pinion gear? I have about 1200 miles and am about to change the seal for the second time. At 400 miles it started leaking and now it's leaking again.

I'm using the standard seal from Chicago Rawhide. They were recommended as the replacement from Moser. Seems a bit extreme to be replacing these seals so often. Anyone using another brand or type?

Also, while I think the Moser is a great rear end it does upset me a bit that they don't have a cover over the pinion. The seal is open to the elements....

[big gear head]

I haven't seen this problem. Is it an aluminum or iron pinion housing? Aluminum shouldn't be used on the street (my opinion).

[sporter]

About 8K miles on mine and had over 12k on my son's Moser 9" with just the normal slight seepage. Never had any stains on the garrage floor. Are you using synthetic fluid? I've had issues with synthetics having heavy seepage in the past.

[69Pony]

It's the nodular iron housing and I'm using the fluid that was recommended by Moser - can't remember what it is though....

It is seeping enought to collect a small puddle (3") on the floor with a single drip hanging down. Can't see it actually leaking because the leak isn't that bad. However, I wonder how much it is leaking as I drive?

I thought I started hearing a whine from the rear but that could be me being paranoid.

So the Chicago rawhide seal is OK? Any other recommendations?

[big gear head]

Are you using sealant around the outside of the seal before you install it? Did you put a little grease on the lip of the seal before installing the yoke? Did you smear some sealant into the splines of the yoke before you put it on? All of these are important. The leak could also be from the O ring that goes around the pinion housing.