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Synchrotech Carbon Synchros
New product for the R31/CD/JK Nissan transmission!
BACK IN STOCK!!!!!
UPDATED 3rd gear INNER RING!!! 2-5-2026 We received a new inner ring which fixes the issues with 3rd. If you purchased from us we will send this updated inner ring at no charge. Send us a email with your order number to receive the updated inner ring.
Update: 3rd gear synchro is currently being revised. Until this is complete, 3rd gear synchro will not be available for purchase. You can purchase all other synchros individually.
Carbon synchros significantly enhance shifting performance and feel. They replace the original, less robust synchros, which are known to cause grinding and lockout issues, especially when shifting at high RPMs.
These carbon synchros replace the following OEM synchros. It is recommended to check part numbers in order to confirm fitment. Early transmissions will utilize part number 32604-CD105 for 5th/6th gear synchros. Later transmissions will use part number 32604-5X00A for 5th/6th gear synchros. It can be helpful to use an OEM Nissan parts website to check each part number utilizing your VIN.
- OEM 1st gear synchro: 32620-CD401 (Triple cone)
- OEM 2nd gear synchro: 32620-CD008 (Triple cone)
- OEM 3rd gear synchro: 32620-CD405 (Triple cone)
- OEM 4th gear synchro: 32620-CD01B (Double cone)
- Early OEM 5th/6th gear synchro- 32604-CD105 (Single cone)
- Late OEM 5th/6th gear synchro- 32604-5X00A (Single cone)
Early 5th/6th gear synchro
- 09/2004'-2008' 350z
- 09/2004'-2008' G35
- 2009'-09/2012' 370z
- 2008'- 03/2013' G37
Late 5th/6th gear synchro
- 09/2012'+ 370z
- 03/2013'-15' G37/Q60
A full OEM synchro kit would cost over $989. This kit is a major upgrade, at a fraction of the cost!!!
Features:
Synchrotech Pro Series Carbon Synchros have a full carbon composite lining. The carbon composite material acts as a braking material during gear engagement. This allows for quicker and more precise shifting and prolongs the life of the synchro sleeve and gear engagement teeth.
Includes: - 6 Synchrotech Carbon Synchros (Gears 1st-6th)
Application: - R31/CD/JK Nissan transmissions
- 350z
- 370z
- G35
- G37
- Q60 (3.7)
Professional installation is highly recommended, but DIY installation is also possible. Research to see if this is something that you feel comfortable taking on. There are YouTube videos that can be used for reference of DIY synchro installation into the R31 transmission.
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Just buy a new transmission!