[sean20202020]

2008 Rav4 Base 40,000 km and just 4 years old.

I was able to change the lube for the rear differential. I'll post pics later on this. I went ahead and did an engine oil change too.

I'm considering to replace those fluids like you for my 2006 Rav4 70,000km 6 yrs old.
How was the drained fluid? color? metal? Let us know when you're done.

 

[sean20202020]

The transfer case and driveshaft are always turning. The electro-mechanical clutch is in the rear diff.

Even if the clutch is not connected to the diff,
I guess the diff gears will run whenever the rear tires turn differently.
right?

 

[sean20202020]

For 2006 Rav4 I4 75,000km, I changed transfer case and rear differential fluid, by this post information.
CanadianTire MotorMaster 80W90 gear oil 5L jug for $24 (I need total 3L for 2 SUVs)
Walmart the same hand pump for $16
Lowes 10mm Hex socket for $4

Differential took 2 hours, transfer case for 1 hour with differential's experience.

the 10mm hex socket could not be easily inserted into the plugs because of rust.
also, to break free the plugs I needed long 18" wrench and plenty of muscle, putting on ramps,
and when plugs finally got free, I heard bang sound.

I saw only 1 washer on transfer case's fill plug. other 3 plugs were without washers.
I thought factory forgot to put them. but I read this post again, OP implied all 4 washers were there.
Now I have to search my oil drain pan.
if not there, then they must be on the body safely.

 

[sean20202020]

I'm a little confused. Sticker on transfer case specifies 85W-90. Should I then put 85W-90 in it? Seams as 85W-90 is hard to find. 80W-90 is a lot more common. What is the difference between Hypoid Gear Oil and Regular Gear Oil?

80W-90 is just fine for the value
or put synthetic 75W-90 for longer service life & cold winter location.
You don't need to find 85W-90 because of the label.

 

[sean20202020]

(To Dealer who charged me $130 for this service last time: SUCK IT!!)

lol

2 years ago @75,000km, I replaced the transfer case and rear differential with cheap CanadianTire MotorMaster 80W90 gear oil 5L jug for $24 (I needed total 3L for 2 SUVs)

My Rav4 is @100,000km now,
this time, I purchased CanadianTire MotoMaster Synthetic 75W90 gear oil 5L jug for C$64, and ready to change again soon.

In Canada winter, synthetic is the one to fill.
Royal Purple Synthetic 75W90 is too expensive C$25 per 1 qt. at Canadian Tire.
so I got MotoMaster Synthetic(made by Shell)

 

[sean20202020]

lol

2 years ago @75,000km, I replaced the transfer case and rear differential with cheap CanadianTire MotorMaster 80W90 gear oil 5L jug for $24 (I needed total 3L for 2 SUVs)

My Rav4 is @100,000km now,
this time, I purchased CanadianTire MotoMaster Synthetic 75W90 gear oil 5L jug for C$64, and ready to change again soon.

In Canada winter, synthetic is the one to fill.
Royal Purple Synthetic 75W90 is too expensive C$25 per 1 qt. at Canadian Tire.
so I got MotoMaster Synthetic(made by Shell)

Like I said above, I replaced the fluid with Synthetic today.
Drained fluid after 25,000km was not too bad like picture
but I expect better cold start and fuel efficiency than dino oil.
The picture is my setup. when I finish, I drove out of the ramps with hand tighten fill plug, then opened the plug again to drain to the right fill level.

 

[sean20202020]

If you like my pump in this picture,
Walmart Canada $16 or Deluxe Pump | Canadian Tire $23

Synthetic 75W90 gear oil 5L jug is C$64 at Canadiantire
I got 5L for 2 SUVs's rear diff & transfer case, about 3L needed.

http://www.rav4world.com/forums/99-...3-mechanical/90542-rear-differential-transfer-case-gear-lube-6.html#post1500577