Changed rear diff fluid in my Dana 60 FF LSD.
Only had conventional 80w-90 on hand with 1 qt of Pennzoil saying it had the modifier. So dumped that, along with 2.25 qt's conventional and following
@u2slow advice. I went for a drive not worrying about the modifier.
After warming the fluid up (28F here), I pulled 10 circles each way as tight as the van would turn. (dad's advice)
Zero chattering/grabbing/what-have-ya. And on my gravel frontage road, the LSD hooks up immediately with aggressive throttle leaving equal tire spin per side.
I am stoked, and one less thing to do maintenance-wise. I leave for South Dakota on Sunday.