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[Z06] '03 Z06 question

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Old Jan 22, 2006 | 05:38 PM
  #1  
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Default '03 Z06 question

Can anyone tell me if this VIN (1G1YY12S335123002) is an "early" or "late" production model. How do you tell from the sequence?
Thanks in advance.
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Old Jan 22, 2006 | 06:23 PM
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Try this site:

http://www.corvetteactioncenter.com/...003/index.html

Probably won't help much as they dont list the upper number produced and the serial number series include all C5's. However, lots of good info regarding all C5's. Last 6 of the VIN is the series sequential numbers. Supposedly they start with 100000 and 8635 2003 Z's were produced (total of 35,469 C5's produced in 2003). Its hard to really tell because its impossible to tell how they run in relation to all C5's that were produced, but I would say it appears it would be somewhere in the 2nd half of the year.
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Old Jan 22, 2006 | 06:32 PM
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"late" production model with steel shift forks and the FFS fuel system
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Old Jan 22, 2006 | 06:35 PM
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Thanks to both of you. IT L GO, are you saying that VIN would indicate it is late production with those improvements?
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Old Jan 22, 2006 | 08:35 PM
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The FFS fuel system is easy to determine...just open the glove box and look and the ID label fro the RPO FFS. As far as I've been able to determine, the steel shift forks were a mid-03 change.

I'd sure like to know the exact VIN the steel shift forks started at.
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Old Jan 22, 2006 | 08:39 PM
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Originally Posted by Scott03Z06
I'd sure like to know the exact VIN the steel shift forks started at.
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Old Jan 23, 2006 | 01:03 AM
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It it helps my car has a 109473 number and it was built in October 2002.
Bill
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Old Jan 23, 2006 | 09:32 AM
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Originally Posted by hotwheels57
Thanks to both of you. IT L GO, are you saying that VIN would indicate it is late production with those improvements?
Yes
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Old Jan 23, 2006 | 09:33 AM
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Originally Posted by Scott03Z06
The FFS fuel system is easy to determine...just open the glove box and look and the ID label fro the RPO FFS. As far as I've been able to determine, the steel shift forks were a mid-03 change.

I'd sure like to know the exact VIN the steel shift forks started at.
Me too! All I know is it was sometime in Feb. 2003 for the shift forks. Some of the early FFS cars didn't get the Label in the glove box

More info on the FFS Fuel System at this link
http://www.z06vette.com/forums/showt...&highlight=ffs

Last edited by IT L GO; Jan 23, 2006 at 09:40 AM.
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Old Jan 23, 2006 | 09:00 PM
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Check the left door lock area for a Manufactures sticker...It'll have a month of production left upper corner. Like MAR 2003 etc.
Good Luck
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Old Jan 25, 2006 | 11:37 AM
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My 2003 Z has a 'Born On' date on the drivers' side door. Check there if you don't find what you need from the VIN.
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Old Jan 25, 2006 | 12:08 PM
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That makes it much simpler, thanks...I'll do that.
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Old Jan 25, 2006 | 06:39 PM
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Would anyone care to briefly explain to a new Z06 owner what these two issues "steel shift forks and FFS fuel system" are all about?
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Old Jan 25, 2006 | 07:28 PM
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FFS is the new fuel system that was introduced in mid-03 and is also present on the C6. Go here to read the details http://service.gm.com/gmtechlink/ima.../TLMar04e.html

The B&W T56 6-speed (MN6 and M12 (Z06 specific)) had cast Alum. shift forks prior to approx. mid-03 production. I assume the many complaints about the shifter being stuck in a certain gear and syncro problems and subsequent teardowns of these transmissions revealed the Alum. shift forks were a weak link. They were then replaced with steel shift forks. Note that the Viper, which also uses a T56 tranny, has steel shift forks. It was probably a cost cutting move to use a cast Alum. shift fork over the steel shift fork.
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Old Jan 25, 2006 | 10:07 PM
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Thanks for the explanation.
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Old Jan 27, 2006 | 10:50 PM
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Originally Posted by Scott03Z06
FFS is the new fuel system that was introduced in mid-03 and is also present on the C6. Go here to read the details http://service.gm.com/gmtechlink/ima.../TLMar04e.html

The B&W T56 6-speed (MN6 and M12 (Z06 specific)) had cast Alum. shift forks prior to approx. mid-03 production. I assume the many complaints about the shifter being stuck in a certain gear and syncro problems and subsequent teardowns of these transmissions revealed the Alum. shift forks were a weak link. They were then replaced with steel shift forks. Note that the Viper, which also uses a T56 tranny, has steel shift forks. It was probably a cost cutting move to use a cast Alum. shift fork over the steel shift fork.
Weight savings not money
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Old Jan 31, 2006 | 12:00 PM
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Is there a disadvantage with the cast aluminum shift forks that I should be aware of?
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