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2004 4Runner Differential & Transfer Case #5465788 06/29/20 04:34 PM
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Gannet167 Offline OP
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I have 2004 4Runner with the 2WD / Full Time 4WD / 4 Lo transfer case. I need to change front & rear diff & transfer case fluids.

The manual calls for:
Front diff: 75w-90 GL-5
Rear diff: 90w GL-5, or 80w-90 GL-5 below -18C / 0F
Transfer Case: 75w-90 GL-5

Both front and rear diffs are open, no limited slip. Typical temperatures in my area range from approx -30C / -20F to +30C / 90F.

I'm considering Amsoil Long Life Synthetic Gear Lube 75w-90 in all 3. I can get it off the shelf at a store in my area and a little cheaper than Pennzoil Full Synthetic GL-5 or Castrol Syntec GL-5. I know Amsoil Severe Gear is also good but more $ and not as easily sourced. It also has limited slip additives which I don't need, although wouldn't hurt.

Any thoughts on Amsoil Gear Lube and using 75w-90 instead of 80w-90 in rear diff?

Re: 2004 4Runner Differential & Transfer Case [Re: Gannet167] #5465808 06/29/20 05:01 PM
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ford46guy Offline
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Can't go wrong with Amsoil. I had this decision with the Lexus GS. It wants 80W90 in the front diff and 75W85 in the rear. Amsoil would have certainly been compatible.
Special transfer case that uses trans fluid.
If you are not racing or severe service, I'm sure those other brands are fine. I went with the Toyota Stuff and Valvoline 80W90


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 2004 4Runner Differential & Transfer Case [Re: Gannet167] #5465810 06/29/20 05:05 PM
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Gannet167 Offline OP
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In theory, a 75w-90 and 80-90 behave the same at temperature. It's only when cold that the 75 and 80 hypothetically differ ?

Re: 2004 4Runner Differential & Transfer Case [Re: Gannet167] #5465831 06/29/20 05:37 PM
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toytaco970 Offline
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You'll be fine. I have been using the Amsoil severe gear 75w/90 in my '03 V8 4x4 Limited, full time 4wd as well, for over 100k miles and no issues whatsoever. I put it in about 145k when I purchased it, and changed it at 230k and the fluid was still in great shape. Only did mild 4wd trails and probably about 5k miles of towing around 4000lbs. Low temps pushing -30 in the winter when I lived in the ID mountains, and +105 summer temps in Boise. I'm about to hit 250k and it still runs as good as new.
Also I have been using the Amsoil signature multi-vehicle ATF the entire time as well, no issues and perfect shifts. Mine has a trans dipstick as uses T-IV fluid, not WS.

Last edited by toytaco970; 06/29/20 05:38 PM.
Re: 2004 4Runner Differential & Transfer Case [Re: Gannet167] #5465843 06/29/20 05:45 PM
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Gannet167 Offline OP
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Good to know. Thanks.

I'll put a vote in as well for Amsoil Signature Multi-vehicle ATF, with a bottle of LubeGuard. I did a full flush, 14+ qts. I also have a dipstick on my A340 transmission that uses T-IV, and added a remote spin on filter.

Re: 2004 4Runner Differential & Transfer Case [Re: Gannet167] #5465901 06/29/20 07:53 PM
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bronx Offline
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I ran with redline 75w90 with no issues in my 06 4Runner, diffs and transfer case. I’m sure it will like amsoil just as much. You could probably skip the lubgard if you’re going to use amsoil signature atf.

Re: 2004 4Runner Differential & Transfer Case [Re: Gannet167] #5465990 06/29/20 10:50 PM
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Snagglefoot Offline
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When in Saskatchewan......
I believe BrianF is a big fan of this.

BE7433D6-D687-4573-B8AF-B056DCE212C9.png

If you want the job done right......do it yourself.
Re: 2004 4Runner Differential & Transfer Case [Re: Gannet167] #5466204 06/30/20 09:27 AM
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CARJ Offline
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I use 75w90 in my 2004 4Runner---works fine.


2004 Toyota 4Runner | 198k | M1 5w-30, YZZD3
2012 VW Passat | 98k | M1 0w-40, XG9911
1997 Honda Civic HX | 226k| Castrol Extended 5w-30, XG3593a
Re: 2004 4Runner Differential & Transfer Case [Re: Snagglefoot] #5466326 06/30/20 12:33 PM
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Gannet167 Offline OP
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Originally Posted by Snagglefoot
When in Saskatchewan......
I believe BrianF is a big fan of this.



I hadn't considered that. Thank you.

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