jamas-
there are main seals in both axles, its what seals between the pumpkin and the gearing housing. Not difficult to replace, and just keep an eye on your diff fluid and your fine to drive it (if its the seal on the axle)....
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if its the rear main seal (the front axle has multiple seals, and they call that one the rear main), then its only about 10 bolts i thinkthen they put the new seal in, and bolt it back into place.
any axle should should be able to take care of it for ya. just check your fluid before you drive it and make sure you havent lost too much.
You said that the fluid on the outside of your rim that you stuck your finger in smelled bad. What did it smell like? Was it a very strong petroleum smell?
If so, I'm assuming that it's from the front differential but I don't know how it would get on the outside of the rim without getting all over the inside as well.
None of the other fluids mentioned have that strong of a smell (power steering, brake fluid, bearing grease (either front bearings or CVs)).
If I were you, I would do the following in this order:
Check fluid level in front pumpkin
Jack up vehicle (wheel with suspect leak) & shake wheel top to bottom to see if bearing is shot.
Check CVs again but not just for split boots, also check to see if you can determine if grease is getting out past the bands at each end of each boot.
Check other fluids (brake, power steering) to see if level is low or if the smell is similar.
[SIGPIC][/SIGPIC]
Put a smiley after you say that Bub.