RB25 GTST gear box?

[kidslice]

Dose anyone know what kind of gear box is on a stock rb25 gtst? Dose it have brass synchros or steel? Is it a " servo box " or a " Board warner box "??? Been searching for a few days but no luck so far. Used to have a pdf on the whole car in english but cant %$#@#* find it on my comp. Waaaaack!

[dbeiler]

You mean Borg Warner? No, it's a Nissan transmission. It uses brass synchros. Nobody uses steel synchros. It would be a dog-box at that point.

[kidslice]

yea miss spelled borg. Trying to get my learn on the trans. Was told to find out what kind of syncro it has to determine gear oil. Read on a few forums what to use but some contradicted the other so wanted to be sure. And its def not a straight cut gear box lol. Would be kinda kool but loud as &^$%! Any suggestions on gear oil for the rb25 gtst trans??? I was just gunna go with redline MT-90 GL-4. I have some redline 75W90 GL-5 but I was told not to put a hypoid gear oil ( GL-5 ) in the trans.

[Sforteen]

I tried a few different oils but i think AMS OIL 75-90 Manual transmission fluid works best..

[Sileighty_85]

Uses GL-4. Don't use GL-5

[Mitsubayati]

GL-5 will break down the brass synchros. GL-4 is recommended for that trans. I run MT-90 in my RB25 trans. It is kind of notchy though but I beat on it and it's on my track car so I don't care.