Ok so its time to change the rear diff fluid. What fluid and weight is everyone using? I was thinking of going royal purple...:TU:
I like the thicker stuff,like the 85/140,but that's just my preference. If you have a clutch style posi unit,or something similar,you do not want to put synthetics in there.It is more slippery,& can wear your unit faster.Most of your unit companies,like Eaton,will have a tag in the box with a note warning against that.
