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09 XB Automatic Trans Upgrades?

2400 Views 2 Replies 2 Participants Last post by  TurboNova
Is there anyone modding the auto trans in the XB? We put a turbo kit on one and tuned the ECU with an AEM FIC, it made 235 whp at 8 psi but after the first day reverse broke in the trans. It is locked up in reverse but will drive forward. Is there anyone playing around on the inside of the trans on these yet?

Brian Macy
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I've not heard of any upgrades but I've also not really checked around.

Did you make any changes to the ECU reguarding the shift points of the transmission and timing of the solenoids?

The Superchargers run's 7psi without any auto trans issues. I wouldn't think that one more pound would be an issue.
I didn't know there was a way to get into the 09 computer and change the trans settings.

We used an AEM piggy back ECU with the stock ECU running everything else.

A supercharger makes 7 psi later in the rpm band than the turbo will. That might be the difference.

We are trying to come up with a fix for this guy other than take all the stuff off and have the dealer fix it.
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