Hey grandmastercow
You are over your limit on PMs
Well since you have an auto I would stick with a 3.73 upgrade. You have to think ahead though. If your going forced induction you might think about sticking with the 3.42s to save on traction issues later. It all depends on what plans you have. I'm running 3.73s. Only 6 speed cars upgrade to 4.10s. Well unless you are going all out and have the car dedicated to the track only.
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1999 MBM T/A - the new ride 
2004 CE Corvette - 1.410 - 10.246 @ 133.39
2003 Silverado - Lifted 6 on 35s
2000 T/A WS6 - 11.190 @ 119.79...SOLD
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