Community-reported: crunchy or failed synchros on 2003-2004 6MT cars
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What causes "Community-reported: crunchy or failed synchros on 2003-2004 6MT cars" on the Infiniti G35 (V35, 2003-2007 sedan and coupe), and how is it fixed?
Owners complain of weak synchros; 2005 6MT cars got the revised CD009 transmission. Fix: Test every gear on a test drive and budget for a rebuild if it grinds.
Symptoms
Grinding shifts.
Cause
Owners complain of weak synchros; 2005 6MT cars got the revised CD009 transmission.
Fix (summary)
Test every gear on a test drive and budget for a rebuild if it grinds.
Other V35 problems
- Recall: crank and cam position sensors can cause stalling or a no-start (2003)
- Recall: fuel filler hose can crack and leak (2003-2004)
- Recall: passenger seat sensor harness can disable the airbag (2005-2007)
- Recall: fuel pump outlet hose may not be attached (2003)
- Recall: brake stop lamp switch can malfunction (2003)
- Rev-up engine oil consumption (2005-2007 manual cars)
More for this car
- All Infiniti G35 (V35, 2003-2007 sedan and coupe) fitment answers · V35 common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- Infiniti G35: a buyer's guide — Grassroots Motorsports (forum post) (forum thread; read 2026-10-26; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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