Can you use the same type of oil for Front / Rear Diff's & Transfer Case

I called Mobil1 Tech support and was told by the tech that the 75w90 would be fine for the diffs on the Tacoma

 

I go by what Toyota says since they made the vehicle. Obviously anyone can trust whoever they like.

 

That is technically true. However it's a matter of splitting hairs -- the difference is so slight, the differentials will never know if they contain 75W-85 or

$30 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75W-90.
I agree, you should use whatever you are most comfortable with.
There's also a chance that in EPA testing, 75W-85 resulted in a miniscule improvement in MPG ratings, so it got the nod.

 

I've used 75w90 GL5 on Toyota trucks diffs and tcases since I started in 2005. Real transfer case fluid is rare and only the most uptight of owners request it.

 

Just ordered Amsoil Severe Gear 75w/90. Hope this is ok?

 

Amsoil's website says it meets GL-5 requirements... it's full synthetic.... it should be just fine!

 

As long as it meets the GL-5 requirements. You're good to go.

I use 75w90 in all three. I just can't remember the brand off hand.

 

Ive been running royal purple 75w90 in all three for 30k. Truck runs great. You can pick up 6 quarts on Amazon for 88$ and the package of washers for $11 or so. Another thing to think about is swapping the front differential drain plug to the hex nut style. I ordered one for 15 bucks or so. I think the hex nut style is standard equipment on Lexus diffs, but the taco gets the cheap Allen wrench style.

To answer the op's question, yes, you can use the same on all three. I used mobile 1 the first time I changed all three and it was about 11$ a quart. The last time I looked, it was $17 so I decided to go with royal purple because it was cheaper $14.50 vrs $17 and change for Mobil 1.

$14 GENUINE TOYOTA GASKET KIT FOR TRANSFER AND DIFFERENTIAL SERVICE

https://www.amazon.com/gp/aw/d/B017V4BAXI?psc=1&ref=ppx_pop_mob_b_asin_title

$108 Royal Purple 01300 Max-Gear Synthetic Gear Lube Oil 75W90 Pack of 6 Quarts

https://www.amazon.com/gp/aw/d/B007SPLZL8?psc=1&ref=ppx_pop_mob_b_asin_title

Toyoya 90341-24016 PLUG, STRAIGHT SCREW

https://www.amazon.com/Toyoya-90341...1579391236&s=automotive&sr=1-1&language=en_US

 

Looking at my 2015 owners manual under transfer case lube it specs a GL5 not a GL4. I myself use Amsoil severe gear 75W90 GL5.

Now this may not apply to earlier manual shifted transfer cases. Just know it applies to my 2015 electric shifted one.



Transfer (4WD models)
1.1 qt. (1.0 L, 0.9 Imp.qt.)
Gear oil API GL-5
SAE

$30 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75W-90


IMHO , I am a firm believer in fluid changes. But i know there are those that never do, do according to maintenance schedule or some like me more often.

I did my rear diff about 10K. There was a collection on the drain plug magnet and the lube did indeed have the look of finely distributed metallic silver paint... As one would expect of a hypoid gear set that has had a chance to wear in.
My preference was to get this initial wear material out so the bearings etc are not being worn by this material. Now that its done and has fresh synthetic lube I will probably go at least 100K before I even consider changing it again..

As for the transfer case the lube was clean so the 10K change was overkill. But it gave me the chance to add a magnetic drain plug and synthetic so I will probably never need to change it again..

And same goes for the front diff.. Since its only really experiences any wear is when in 4WD and is freewheeling the rest of the time the change was also overkill.
But added a new magnetic drain plug with a hex nut instead of the 10MM allen key version and synthetic... It to will probably never need to be changed again.

Did i waste some $ and perfectly good lube , yes in case of transfer and front diff. No in the case of the rear.. But it was easy to do, not expensive and gave me a chance to confirm the fluid condition. And i swear by synthetic lubes for lifespan and cold weather performance which is sometimes needed in Canada.