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Gear oil help please

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Old Feb 26, 2007, 11:21 PM   #1
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Gear oil help please

So, im wondering what you guys think i should use for gear oil.

im spending almost $2000 on my new drivetrain, which will be installed very soon. however, there is some discussion on what kind of gear oil is best. apparently GL-4 is better for your syncros, but GL-5 is better for the Center LSD (my front diff is open). i waited a long time to get my new tranny, which is a hard to find style with dual and triple cone syncros (cause thats the only thing that wears out on these transmissions). i really don't want to put something in there that will not protect the syncros properly, but i plan on running 400-500 hp through the this thing, so i don't want the LSD on the transfer case to have accelerated wear.

I should also include that there is also a debate on what weight to use? Toyota recommends a few different ones: 75w-90, 80w-90, 80w or 90.

So what do you guys run in your awd tranny? is there a way to protect the syncros and protect the center viscous LSD?

BTW, this is not for a Evo, but i would really appreciate some help.

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T-Trac wrote:
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Denver_whiteST185 wrote:
from what ive gotten from the MR2 boards is that 75W-90 GL-4 gear oil is the best for our trannies and diffs.

If you want smooth shifts and dont mind blowing up your transfer case, go ahead and use GL-4. We need GL-5 protection in our gearboxes because of the transfer case that uses the same fluid. Most GL-5 fluids are meant for differentials and do not offer any protection for our synchros. Ideally you want to use a 75/90 fluid that protects for GL-4 and GL-5 so that you can have synchro and transfer case protection. I've been doing quite a bit of digging around and it seems that Castrol Syntrax Universal would be a good match, but you cant get it in the US, so I just ordered some Silkolene Silktran SYN 5 which seems to fit our application as well. I wont know how well it works till I try it.
Use GL-5 Hypoid Diff Fluid in differential, do not use GL-4 in diff. Might as well just put water in it if you do!!
just my $0.02

Last edited by Denverwhitetrac; Feb 26, 2007 at 11:31 PM.
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Old Feb 27, 2007, 06:02 AM   #2
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redline MT90 for the trans, and stock Diaqueen from mitsu for everything else....... try searching there is alot of info on this topic....
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Old Feb 27, 2007, 10:08 AM   #3
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OP is this a question about an Evo or your Yota?
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Old Feb 27, 2007, 10:10 AM   #4
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OEM in front and rear, RL MT90 can be used in trans.

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redline MT90 for the trans, and stock Diaqueen from mitsu for everything else....... try searching there is alot of info on this topic....
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75w90, 80w90, alltrac, gear, gosuper, mr2, oil, protect, silkolene, silktran, syn, synchros, syncros, toyota, transmission

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