Can I use the same 80w-90 gear oil for the differentials in the swivels and transfer case too?

I know RAVE says API or GL-5 80 or 90 EP depending on temperature for both swivels and transfer case. Is 80w-90 the same as EP 90 or 80?

I hope I'm using the right weight too. It gets down to 20 F here and up to 110 F in the summer.

 

transfer case.... yes
in the swivels you might want to use the one shot grease packets ....the gear lube tends to leak by the seals on the swivels.....go to a lawnmower shop and get some " 00 grease" its the same as the grease packets sold by all the suppliers

 

Do yourself a huge favor and use 85w-140 gear lube everywhere that takes gear lube.
You will need 7 qts to do both diffs and the t-case.
For the swivels use the "00" grease, I use plain grease, but the "00" is what it is speced for.
land Rover switched to that after customers complained about leaks with the gear lube making a mess in their driveway.

 

Do you recommend using 85w-140 because of the lower noise or because it gives you a viscous LSD or something?

It seems like oil would be a lot easier to get in and out than grease. I don't mind a small leak unless it's all going to leak out in a month...

 

Lower noise, your truck already has many miles on it, so it will help. And when you put the grease or 00 grease in the swivels, turn wheel hard to one side so it can actually have a straight shot down from the top. The space inside there is about a small grapefruit, the swivels are hefty. Not too much goes in there, but if you just squirt on top you have not done much. Carefull with the drain brass fittings, they are baby stength compared to what you have been wrenching.

 

When you run the cv with grease, you don't remove it. The newer swivel ***** don't even have drains.

 

Using a 75 or 85/140 gives much better wear protection in any application.

 

Thanks guys. How important is using synthetic here?

 

synthetic was a way for them to slightly improve MPG and increase the time between fluid changes. The transfer case is mostly the same between D1 and D2, and D1 doesn't "require" synthetic, but D2 "does" Use whatever you want, change it often, at least every 2 years, or every year if you drive it hard.

 

Thanks. One last question. Do you just fill the swivels up to the fill port like the differentials, or do you have to actually measure the oil/grease?