When i bought my Ranger i noticed after a few days the Rear differential was leaking by the pinion seal. I filled it up with 80w-90 gear oil and have put around 500+ miles on and havent noticed any leaks. Then recently i was using the 4x4 and now the front diff looks like it is leaking from the seal. I'm kinda confused.... i didnt go above 35 with it in 4x4 high or 20 in 4x4.

 

I'd change the fluid in both diffs and replace the pinion seals

 

Time for seals!

Mines leaking slowly, not enough to lose lots of fluid, but its wet.

I'm not gonna bother since I'm doing an solid axle swap.

How bad is yours leaking?