Can I run 80W-90 for both difs and transfer case?
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Dom8706
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Toyota recommends SAE 75W-90 in the transfer case and the front diff. SAE 80W-90 in the rear. I personally do not see any issues with running 80w or 75w in all of them. I do believe 80w is a little thicker and it works better in warmer conditions. But i dont know if youll notice a difference or not.
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JZiggy
Senior Member
It won't matter much either way. The only difference is the viscosity when cold -- the 75W will flow better. If you're in a sub zero climate spring for the 75
The 80W-90 spec for the rear diff is an old school carryover spec. No reason for it not to be 75W-90
19963.4lsr5
New member
75w-90 is usually a synthetic or semisynthetic. 80-90 hardly ever is in the stores.
I run 75w-140 in the rear and 75w-90 everywhere else.
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I run 75w-140 in the rear and 75w-90 everywhere else.
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Dom8706
New member
Why do you run 75w-140 in the rear if you don't mind me asking.
19963.4lsr5
New member
Because I had it on the shelf and it’s synthetic and heavier duty.
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MarkBlack
New member
The O'Reillys by me only had 80w-90, they didnt have 75w-90 thats why im asking
many use 75-90wt mobil synthetic in the diff's.. also the toyota dealerships use this gear oil.
the transfer case requires a special fluid. reason is it has electrical devices in the tranfercase and the bearings require additives to reduce wear. $80 a QT..
my diff's still have mobil synthetic 75-90wt and still looking like new.
cold temps not a problem ..
I do not live in a 100F plus area .. so some in these hot spots do use 145wt gear oil...they also put on a heat sink to reduce the diff temp...
80-90wt is GL5 spec. I use that gear oil on on my GM sedan with a limited rear diff.. cannot use synthetic in that diff... clutch will cause chatter .
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JZiggy
Senior Member
Really? Never heard of this, but I don't have an electronic xfer case.
Any GL-5 fluid is, by default, packed with anti-wear additives. The GL rating pretty much designates how much additive is necessary.
19963.4lsr5
New member
If you have a Walmart near you get their Supertech and change it every 30,000 miles, We have drain plugs.
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You have a manual engaged transfer case then you use the manufacturers spec.
I also have a GM 4WD auto / 4wd hi/lo truck push button on dash.
the actuator is not mounted in the transfer case mounted on the exterior of it .. so no electrical components in the case. I must use TRAC II in this transfer case because it has a specific lubricants that stop the clunking .
I check it every oil change and if it looks blue its good if it looks a grayish color I change it. 30K on it it began clunking then changed the fluid no clunk.. shifts much faster in/out of 4WD ..
Toyota transfer case on my 2016 runner is electrical actuators in it .. so fluid has in it a large amount of friction reducing additives which reduces wear and faster engagement ..
GL5 is very cheap compared to this toyota special transfer case lube.
I do not want to pay for replacing the transfer case ..
19963.4lsr5
New member
There is a limited slip additive to stop chatter. And some oils have it already in the bottle.
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This is the 3rd gen forum.
You're muddying the water with info for a newer 4runner or GM product.
If you put what vehicle you had in your sig people could figure that out quicker.
You're muddying the water with info for a newer 4runner or GM product.
If you put what vehicle you had in your sig people could figure that out quicker.
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mark black did not indicate what runner he is working on .
forum has a tricky setup since all these 4 runner's are packed into the same pages. many also did not state what gen there working on ..
being a owner of these vehicles it is complicated on what fluids to be used on many GEN runner vehicles.
many jump into these forums to figure out what is the proper maintenance on various GEN spec..
JZiggy
Senior Member
Ah, that explains it.
MarkBlack
New member
Sorry for the confusion! I have a 1997 4runner. I only post in the 3rd gen section, so I wasn't aware of the cross thread issue. I went to a different shop and just went with what the owners manual said. However, they only had MasterPro oil. So I hope MasterPro is of good quality. I'm not sure when the previous owner did the last fluid change, but everything looked super clean! No metal shavings in the dif! So I'm stoked!
if the fluid looks off color then do the fluid change..
previous owner did the proper work on it .. old runner and your comment on the fluid condition no vehicle abuse.. Master pro lube ?
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