what rear end fluid to use?

[jd4242]

Im rebuilding my rearend,new gears everything. What fluid and weight should i use to break it in.its just an open carrier for now,an aussie will be going in later when i can afford it!

 

[FIND]

Just regular gear oil is fine.

I'd use dino oil since you are going to be draining it out again soon anyways.

 

[jd4242]

What weight?

 

[4x4junkie]

75W-90 should be fine.

If it gets pretty hot during the summer where you are, 85W-140 might be better.

 

[baphomet666]

Here in France there in my truck with that 85W-140 for me it's very good

:exp:

 

[FIND]

just plain cheap 80w90 if you are going to do the aussie locker later this year yet.

 

[Anime]

You can get generic or cheap 80W-90 gear oil at the parts store in gallon containers for about what it costs for a quart of 75W-90 synthetic. Supposedly regular gear oil is good for ~100,000 miles, so changing it out at half that is some pretty decent maintenance.

That said, the 75W-90 is great stuff, and what I'd suggest once you get it finished up with the locker of your choice and don't plan on opening it up again until it's time for a fluid change. Some lockers or limited slips with the lower gear ratios call for 80W-140 though, so a 75W-140 synthetic is what to use for those, some of which come with friction modifier for LS diffs already added, so be careful if you don't want it in there.

 

[baphomet666]

if it does not make a big difference for sure this can be good.
But I think when the truck starts to eat many miles
It may be better for him to have a better quality.
it is also possible that I make a mistake.

:exp: