2011 SHO. A 400whp grocery getter.

[SHOdded]

There are a couple of TSBs that may fit the bill:
http://www.revbase.com/BBBMOTOR/TSb/DownloadPdf?id=176597
http://www.revbase.com/BBBMOTOR/TSb/DownloadPdf?id=180543

Transmission Range Selector or Valve Body modification.

Alternate possibility is the TSS/OSS sensor combo.

PCM calibration up to date?  If you do get an update at the dealer, with a new strategy code, get your tune updated as well.

 

[diponyou]

Well that is an awesome call on the strategy code. I honestly did not even think of that.

And today for the first time it did that slipping thing in first then jerking into gear. Couldn't replicate it though.

I got an updated tune from torrie for the 170 and 3bar, this thing is definitely a different beast from stock.