fishhuntnc

I changed the fluids on my GX without jacking it up at all. It's roomy under the rear diff area. For the transfer case, slide in under the passenger side, middle of the truck. For the front diff, I slid in under the left front bumper - a little tight in there but there was enough room to operate my ratchet and oil bottle with hand pump.

The most awkward operation to me was trying to get at the 2 grease zerks on the back of the front prop shaft. I held the grease gun nozzle on the zerk with one hand while my 16 year old squeezed the trigger. It wasn't pretty, but it worked...

Lexmex

What fluid is everyone using?

For our 4Runner, I've been using Redline 75W90.

fishhuntnc

I used Mobil 1 75W90 gear oil for both diffs and the transfer case and Mobil 1 grease for all grease fittings.

stiles_s

Do we have a limited slip diff in the rear of the GX? I think we do...

If so, does it require a different diff fluid? Typically you use different fluid for limited slip...

ALAN553

I believe we do, but the addition additive is becoming obsolete now that synthetics are becoming the standard.

fishhuntnc

Yes, we have limited slip differentials. My '05 owners manual calls for GL-5 fluid for the diffs and the transfer case. The Mobil 1 75W90 meets the specs, and I'm sure many other brands do too.

IanB2

I think you guys are mistaken, the GX470 has open front and rear diffs with a locking Torsen center diff, no LSD from the factory. No special additives required for any of those fluids.

Johnny Rad

http://www.lexus.com/cpo/model_library/GX/2008.html


When in doubt, goto the source....

ALAN553

ifferential TORSEN® [9] limited-slip center differential (with manual-locking feature)

guess that answers the question

IanB2

That's the center diff though, not the rear diff. It's the same unit used in the Audi Quatro AWD systems center diff, it just allows uneven torque split to the front and rear axles, the effect is not the same as it if was in the front or rear diff, althought technically you could still call it an LSD.

RickC5

Does it? I think not.....

The "center" differential is NOT the front or rear differential, neither of which is described in that link. I think Ianb2 has it nailed.

fishhuntnc

Attached is the paragraph from my '05 owners manual. The original question was whether we need a different fluid due to the LSD. The Mobil 1 75W90 literature states: Mobil 1 Synthetic Gear Lube LS 75W-90 exceeds the most severe service requirements in both conventional and limited slip applications. I take that to mean that it works for the GX.

IanB2

Agreed, it's only the clutch type LSD's that require a friction modifier, and the Torsen center diff is not a clutch type LSD.