Diffs and transfer case fluids

Looking to get the fluids done on the diffs and transfer case. What works or what’s best out there without having to go through dealership? The more specific, the better. Thanks.

 

I bought all Toyota fluids and did it myself. Got fluids off Amazon. Transfer case fluid was expensive. The rest was nominal.

Transfer - LF version, 75W
Diffs - LT version, GL5 75W-85

 

Just make sure and use a 75w in the t-case, otherwise pretty mundane.

 

I used some mobile 1 75W, there are some good discussions about it, I'll try to find it

 

Just about everyone on here are going to push Toyota fluids.

These are always readily available and cheaper.

Diffs: Amsoil Severe gear 75w-90
Transfer Case: Ravenol MTF-3 75W

 

I don't recommend the toyota fluids, they're overpriced. Mobile 1 has done perfectly fine for me

 

I am using Ravenol Fluid, MTF-3 for the Transfer Case and MTF-1 for the Differentials. Using Mobil1 for the engine and Toyota OEM for ATF and Engine Coolant.

 

At what mileage should I look into changing the diffs and t/c fluids on my 2020?

 

every 30k

 

Also, remember to swap out the washers on all of them, don't reuse the old one

 

Would you happen to have the part numbers for drain and fill crush washers for the diffs and T-case?

 

https://www.amazon.com/your-orders/...pmentId=DsV13mcYK&packageId=1&asin=B017V4BAXI

 

Both of our diffs are open so you don’t need anything special. Just stay within spec.

 

I used the Amsoil severe gear in the differentials.
I used the Toyota stuff in the T case. Yup it is expensive at $55 a liter but it comes in the cool old school can. I swap these fluids at 50k so only do it every five years or so.
While I don’t think the Ravenol will do any harm there are a number of reports of less than smooth shifts into 4wd and some folks not engaging without turning the wheel to one side a bit.

 

I have used the Ravenol for 10 years now, no issues at all.

 

Great point about the transfer case especially with the recommendation about 10 miles of 4WD per month from Toyota. Maybe a premium in the t-case is worth it.

As for the diffs, I have only seen stringent specs when limited slip mechanics are involved.

 

Nah, just got the washers straight from Toyota

 

Ravenol works great for me, had it in for about 35k miles now, I use 4wd alot and it shifts smooottthhhh, and the shifts are consistent.

 

I have heard of many folks having no issues. I just know my luck so figure I’ll spend a few bucks more. I only do about 10k a year so it is not a big deal. If I did a bunch more mileage I might give it a go.

 

Is the dealer the only source for the washers?

 

Nope
Rexka Transfer & Differential Service Gasket Kit Fits Toyota Lexus 4Runner Land Cruiser Tundra Tacoma FJ Cruiser Highlander RAV4 Sequoia Sienna 12157-

$7 Rexka 12pcs Transfer & Differential Service Gasket Kit Compatible with Toyota Lexus 4Runner Land Cruiser Tundra Tacoma FJ Cruiser Highlander RAV4 Sequoia Sienna 1215710010 9043024003 90430A0003

https://www.amazon.com/dp/B07CJHTDVV/ref=cm_sw_r_cp_apip_kNCAHgyss8Cxk

 

I'm sure they aren't it was just the fastest option for me. I am iffy when it comes to Amazon.

 

Thanks y’all

 

I just wanted to correct my post - lately I have been using the Kirkland Signature Full Synthetic from Costco rather than Mobil1. Normally $25 for two 5-qt jugs now on sale for $21. Good reviews on Bobistheoilguy.com

 

Where did you get that information. I went through 2020 Tundra maintenance schedule and up to 120,000 miles and none of them mentioned that we have to change out difs and transfer case fluids. Toyota onle mentioned inspect the difs and transfer cace fluids. I normally do it every 100,000 miles on my other vehicles but I don't think we need to change them out.

 

https://www.tundras.com/threads/tundra-maintenance-guide.315/

 

2020 maintenance card....

 

Is it an issue if we use limited slip diff oil in our open differentials?

 

No. Absolutely not. Frankly, it’s a waste of money.

 

This is for special operating conditions, though. Many people who have Tundras don't tow, haul, or have a car topper, so according to the schedule there is no need to change those fluids in that situation.

While this may not be all of us, it is something to note.