A6---transmission
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
500 is safe........550 is pretty safe on the street but not for much racing. Many discussions on it and many members here have tested the limits so they might chime in with real world experience. For now, here's just one recent thread: 
http://forums.corvetteforum.com/c6-t...installed.html
http://forums.corvetteforum.com/c6-t...installed.html
Thread Starter
Instructor
Joined: Jun 2010
Posts: 160
Likes: 0
From: Spring Lake Michigan
500 is safe........550 is pretty safe on the street but not for much racing. Many discussions on it and many members here have tested the limits so they might chime in with real world experience. For now, here's just one recent thread:
http://forums.corvetteforum.com/c6-t...installed.html
http://forums.corvetteforum.com/c6-t...installed.html
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
The 556 HP CTS-V and the 580 HP ZL1 Camaro have ~475-500 rwhp and GM went to the expense to go with the larger, more robust, 6L90 transmission instead of the 6L80 that is used in the Corvette C6. Maybe GM knows something.
Race Director
Joined: Dec 2005
Posts: 11,885
Likes: 107
From: God's Country, ID
I'm currently at 600rwhp/600tq and the tranny's holding up fine. In fact, it grabs so well when it shifts, today I went sideways on a 2-3rd gear WOT paddle shift.
Street tires help keep the damage under control.
Street tires help keep the damage under control.
Last edited by DSOMC6; Sep 10, 2011 at 11:11 PM.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
It wasn't so much the extra HP in those cars, but the extra weight. Pulling 1000+ additional pounds requires a stronger transmission.
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