Manual Trans Additives??

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Aug 25, 2008 | 12:38 PM

Kim72

Thread Starter

Pro

Joined: Oct 2000

Posts: 558

Likes: 22

From: Vancouver, B.C., Canada

Manual Trans Additives??

After installing new motor and clutch I've just recently changed the gear oil in my M21. Used 80/90w gear oil as my manual calls for. Any suggestions for adding any additives to this trans?? It seems to run great but I'm hearing a slight gear whine, between shifts, that I wasn't hearing before.

Aug 25, 2008 | 12:46 PM

ray79

Intermediate

Joined: Nov 2005

Posts: 47

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From: Clifton VA

Event the Tremec manual suggests GM Syncromesh fluid. Maybe someone else knows whats actually in it?

Aug 25, 2008 | 12:53 PM

pws69

Melting Slicks

Joined: Nov 2001

Posts: 2,668

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From: Eastern US XX

Quote:

Originally Posted by Kim72

When I switched to Mobil 1 Gear a few years ago, all gear whine went away. Shifts real smooth and crisp - never grinds. Some will say not to use it, but unless you are all out racing, I can't see the harm. From my experience, it's a good thing!

Aug 25, 2008 | 01:52 PM

wfo76

Drifting

Joined: Sep 2006

Posts: 1,259

Likes: 2

From: MS

Quote:

Originally Posted by ray79

Event the Tremec manual suggests GM Syncromesh fluid. Maybe someone else knows whats actually in it?

Snychromesh is basically automatic transmission fluid.

OK in some newer manual trannies but not in the older Muncies and T-10s; stick with 80W-90.

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