read this from pontiac site :
Custom tailored and performance tuned, the 4-Speed Automatic provides performance that rivals that of the Tremec given a 0 to 60 time of 4.6 seconds. The secret: Software programmed to match the 4L65-E to the LS2's on-and-off throttle characteristics.
and if you see this article :
http://motortrend.com/roadtests/seda...io/index7.html
you will see that the acc for mt gto is in 5 sec ..
majidz