Differential Gear Oil

I have been using 75w90 for my differential gear oil but have been seeing conflicting info and what's best. I have a dana30 up front with 4.88 gears no locker and a dana44 in the back withe 4.88 gears and an eaton elocker. Ive always used conventional oil not synthetic because it has better heat transfer than synthetic (rather have hot oil than hot gears). This is the first diff change since I had the locker installed. Any recommendations are welcome other wise I'll stick with what worked so far.

 

Interesting topic, here is a discussion on it:https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2760430.
I like to install a magnet in the bottom of the diff to collect metal wear chips along with regular changes.

 

I actually came across that while I was looking around, to be honest that’s where some of my confusion came from, seemed that there was no definitive answer. The magnet is a good idea! How did you mount it in there?

 

ITS A MAGNET

 

I would suggest on the bottom of the inside diff away from any moving parts, another option would be to get a diff filler plug with a magnet in it.

 

I didn’t mean to like a smart ass but it’s
A Magnet it’s not going anywhere I have had one in mine for years it sticks and doesn’t move.

 

No I get it haha I just would be terrified that it would somehow end up in the gears with out it secure held down

 

I tend to think it would make a mess, although it probably isn't recommended. I also have screw in magnetic plugs at the drain of my tranny and t-case, those you don't have to be concerned about. I have seen oem installed magnets in auto transmission pans. A screw in location at the bottom of the diffs would be ideal, The older Toyota Land Cruisers came with screw in plugs at that location.