Diff Gear oil

[Marnes702]

I got this big dick Full floater for my Tacoma. Definitely overkill haha It has a Strange case and full spool.

Wondering what Gear Oil everyone is running? Race-Dezert had some old threads on the topic but I think I can relate more with the trucks here. I’ve heard the 250w 300w is too thick and robs HP

 

[Prerunsilverado]

I run Lucas 85-140 in both my trucks and have never had problems doing so.
Have recommended the same in other vehicles I have built and worked on and had the same results.
All were 9 inch with either detroit lockers or spool.
Just recently I put the 85-140 in my daily Ranger (8.8 with limited slip) since that's what we had in the shop and its doing well too.

Nice rear end!

 

[84Prerunner]

250 wont rob any noticeable amount of hp but ive had better luck running redline heavy weight shock proof gear oil. Maxima used to make a straight 140wt I’ve used as well, not sure if they still do.

 

[Klever]

I like Swepco products. In my 10" set up I run 250wt

 

[84Prerunner]

I like Swepco products. In my 10" set up I run 250wt

The industry has been moving away from swepco. Supposedly a couple years ago they reformulated the moly XP oils and it’s having bad foaming issues.
Who knows if it’s a real issue but more than 1 reputable person in the gear industry told me this. I ran swepco 140wt for a few years in my truck, heard this and decided to investigate. Ran my truck on jack stands for only a minute and took the fill cap off after, it was in fact all foam. Switched to the redline I mentioned above, very little visible foaming

Just a little fyi for anyone who cares

 

[84Prerunner]

To add to that, I do have swepco 250wt in the front diff on my wife’s 4runner. Was chasing a clicking noise I thought might be the diff and it has a pinion seal leak. The 250wt “fixed” the pinion leak

 

[Oh4Tahoe]

250 wont rob any noticeable amount of hp but ive had better luck running redline heavy weight shock proof gear oil. Maxima used to make a straight 140wt I’ve used as well, not sure if they still do.

I second redline shock proof