After tearing up 3 stock trannys the past 2 years, and patiantly waiting for a solution for the V160 or t56. I decided to go ahead and give it a shot. I'll be using a 2005 GTO T-56. I found a decent deal on one and it arrived today.

Here is few pics of the stock tranny and the GTO w/a 13b RE auto bellhousing and adaptor.




As you can see they are nearly the same length overall and the GTO shifter sits about an 1" farther back than the stocker.
I'll be mounting the transmission this weekend and taking final measurement to adapt my Tilton slave cylinder to the new bellhousing. and order the clutch discs.

I had the engine face of the bellhousing machined down a 1/4" because the t56 input shaft was a little short in this bellhousing. I would still like to find out how deep a FD auto bellhousing is just for comparison.

I'll take more pictures when the tranny is mounted in the car.