I got one. Very slow, less than a quart=3k miles. Wouldn't even have noticed if I didnt see some oil dampness on the bottom of the bellhousing and inspection plate cover. I removed the cover, and am sure it is the rear main leaking.

Now, I would like to use an additive to try to stop it so I dont have to go through the hassle of dropping the trans,etc to replace.

Which brings me to, what to use?? A leak that small, my first thought was white sheppard. But I also know there are varioue ones out there specifically for rear mains. Some of them can get pricey(>$50).

So, long story short, give the white sheppard a try, or is there something better out there?

 

white sheppard does make one specifically for rear main seals it also goes by the name of blue devil.
Just used it on my D2 this past weekend and it worked!
Did a fresh oil change and put it in before a long drive to the desert about 2 hours of drive time each way + some play time in the desert :-)
Got home and no dripping anymore!

 

The are switching the name of the product, but it still works the same. swells seals.

 

I have a very slow leak from that area too and used both white shepherd stop oil leak and their rear main stop leak none of which stopped the leak. I also noted that my oil pan screws were very loose and I snugged them up but there is still a little bit of leak. People reported good results with white shepherd but it did not do anything to any of my leaks including the transfer case. Use it and hopefully it will work, but don't get your hope go to high

 

It is such a slow leak, I may order and wait for the W.S. rear main stuff, as the only stuff local is their general stop leak.

 

I tried their stop leak in my '98 for a front cover leak. Didn't stop it, but it was much bigger leak than my '04 rear main is. Figure all i got to loose is the 10 or 15 bucks it cost. If it dont work, no biggie. It is not even leaking fast enough to leave a drop on the ground overnite. Yet.

 

The White Shepherd product for rear seals work well for most people. The best way to use it is just after you do an oil change, then follow their directions.
If it doesn't work, you are not out much and I would always suggest doing that before laying out the "BIG BUCKS" for a new real seal.