Looks like I can use synthetic 75W-90 GL-5 rated fluid in both my front and rear diff's and in my 5 speed manual transmission, is this correct?

Also, how difficult is it to change the manual transmission fluid?

Looking at changing all fluids this weekend in my 4x4.

 

There are a lot of existing threads on this, searching "75W-90 GL-4" will get you a lot of results, including this thread: https://www.yotatech.com/forums/f116...ar-oil-266968/ which looks pretty complete.

Short answer:
Yes you CAN use GL-5 in the transmission, but most folks say GL-4 will give you much smoother shifting because it allows the synchros to work better. Redline MT90 is the most highly recommended. It's synthetic, and I don't know of any 75W-90 that comes in conventional / dino variety. Sta-lube from NAPA is close, but is 80W-90 or something like that, so it wouldn't be recommended if you ever got near freezing temps.

 

Thanks! GL-5 has to be used in in the diff's right? Also I can use the 75w-90 in my transfer case, is this correct as well?

Where I live its is below freezing most of the winter. It's usually mid teens at night Dec-Jan.

 

I use Mobil 1 75-90 synthetic in the diffs and transfer case. I find the transmissions in these trucks are picky and since I haven't been in a spot to be able to spring for the redline MT90, the Sta-Lube GL4 85-90 is my next choice.
During cold mornings, sometimes it is slightly harder to shift, but I remedy that by warming up the transmission as the engine is warming up. Simply put the transfer case in neutral and shift the transmission to 1st.




Here's a pictyre of what I yse in my transmission.

 

Yes, GL-5 in the diffs for sure, hypoid gears = GL-5 oil:
- http://www.4crawler.com/4x4/index.sh...ntheticGearOil

T-case and transmission can use either GL-4 or GL-5. As noted above, GL-4 works better in the transmission due to the synchros. T-case makes no difference.

 

OK Thank you guys for the info!

How do you change the manual trans. oil? I don't see where there is a tipstick/fill plug??

 

http://4runner4play.blogspot.com/201...il-change.html

 

Use the link scuba provided but I remove the shift boot and fill from the top until it oozes out the fill plug..way faster...

 

Cool, got it, thanks again guys!