3.91 Gear from GM and "Canned" Diablo Tune?

[BlkWidowSS]

Just ordered 3.91 gear from GM, (PN 19301504), and will have my local dealership handle the installation. I was told that they have to run a specific calibration for the gear to work properly after they finish installing. ("Calibration 12660300, 2011 & L99 Automatic Transmission applications. Note to Dealers: The calibration download and installation is to be charged to labor OP 0601058".)

Question: Concerning my 2011 Camaro SS/L99 6 Speed Automatic, will I need a custom tune after the install and new vehicle calibration, or will the "Canned Diablo 93 ECM Tune and the Canned Firm Shift Tunes" still be compatible and function properly; will changes have to be made to the tunes? Of course everything has been RESTORED and the licensing released...

Thanks.

[06MonteSS]

the tunes will still work fine.. they don't change the gear ratio.. so after the dealer update, you can just install the preset tune and will be good to go.