I'm getting this on the front AND back. So im wondering is this this differnetial fluid? Or hub fluid? What are the seals called front and back and how difficult is it to change.

On my 4runner you just needed a 12mm aren't and a 2.5" pcv pipe. And it was differential fluid.

 

Is it gear lube or grease? They have a different odor.
If it's both wheels on an axle the odds are really good that your axle breathers are clogged and it's gear lube leaking past the axle housing seal.

 

Along with Tom's question, when if ever have you serviced your diffs. wheel bearing seal and in the case of the front, your swivels?

 

Never serviced other than new diff fluid

 

Remove your axle breathers and blow through them with your mouth, sounds like yorui banjo bolts are all rusted up and clogged.

http://www.roverparts.com/Parts/FTC2175.cfm

http://www.roverparts.com/Parts/FTC2176.cfm