BG Syncroshift II in 4Runner transfer case?

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Ok everyone, getting ready to change the transfer case fluid in my 17 4Runner and im sure you have all heard that toyota specs the LF 75w which 99% of all dealers carry and is like $90 per bottle. There are a few recommendations of people using Ravenol 75w or a lot of guys using 75w90 synth gear oil. My only concern was using a gl5 in the transfer case and by what i know gl5 is not yellow metal safe. So i was talking to my BG rep who gave me a few qts of BG Syncroshift II which is a fully synthetic GL4 75w80. i was just curious to know if anyone else has ever used this fluid with good results as i wanted to get some opinions.


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If Toyota says GL4 or GL5 75w then that BG is ok.
If Toyota says LF 75w only, it's different, because LF is GL4+ / GL5.
 

Astro14

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“I have a concern about using something that doesn’t meet spec. So, I will choose this other oil that doesn’t meet spec.” That about right?
 

Astro14

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this was also an email from toyota stating you can use 75w90 but my concern was gl5 I found another member posted online

View attachment 113765
Good to know. Thank you for sharing that. Same year Tundra - same transfer case oil specification.

I've been using a manual transmission 75 - Ravenol makes one, and I actually got a couple of quarts of Titan 75W from JHZR2, which I used for my first transfer case fluid change.
 
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Get the Red Line MT-LV and don't look back. It's been in my 2018 4Runner SR5 for 30K miles and works great.
 

Astro14

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But it doesn't say it's a gl4 or gl5. I think I'm just overthinking the whole thing
Here’s what I reckon, on the same basic unit: if it’s OK for a manual transmission, it’s OK in this. A 75W synthetic like the Ravenol is a safe bet.

Toyota gives GL specs for the front and rear differential, but not this.

So, anything outside the OEM fluid is a guess. But the MTF is a safe bet.
 
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But it doesn't say it's a gl4 or gl5. I think I'm just overthinking the whole thing

Well manual says...

Captura.png


LF 75w or equivalent = 75w GL4+ or GL5 (who says 75w says 75w80 too, but no GL4)

What old manual says...

Captura2.png

75w90 GL5

So clear, it's GL5 75w90 classic spec and 75w GL5 eco spec.
 
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Ive come to believe this guy knows his Toyota stuff. He too, states that GL5 75W90 is perfectly fine in diffs and TCs. He also specifically addresses GL5 being hard on yellow metals in manual transmissions and emphasizes the need for GL4 in those applications. Anecdotally, when I dumped the FF in my 2012 4runner TC I switched to Supertech synthetic 75w90. I now have over 180k trouble free miles.

 
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