I just saw this, I thought I would get notified if someone commented, guess not. Thanks a lot for the input.IIRC, a 3.45 was available with the 2.5l. The swap would not be worth your time or money. Changing from 3.27 to 3.45 would add a tiny fraction of improvement for the cost. If you really want a change that you can feel, look into whether the ATS-V 3.73 rear can be swapped.
I went from 3.23 to 3.73 in my LS1 Camaro and there was a performance gain (measured at the track by myself and many others) and a definite SOTP improvements. The only people that switched to 3.42s were those that started with 2.73s. Nobody went 3.23 to 3.42.
I actually sold my Camaro to buy this, it was a 97 however lt1 with LLOYD elliot stage 2 kit, kook long tubes and 100 shot, sure miss that car but with the kids aging this was more practical. Bought her in 2000 stock with 20k and had her for 16years. A lot of time and money spent with that car ; )
On the Camaro I too went from a 2.73 to a 3.42 in the rear and it was noticable. So I see what you mean. I will look into the 3.73. Thanks a lot.