I'm pretty certain I already know the answer, but I'd like to have it confirmed. Will a 4T45 automatic from a 2007 2.2 work in a 2008 2.2? If so, are there any goofy model year to model year revisions that I need to be aware of ?
I don’t have access to the GM technical data anymore but yes there is a difference. GM updated several components inside the tranny for the 2008MY to withstand the power levels of the HHR SS. There was an updated shift programming for 2008. I think they can be swapped without issues, however I’m not 100% about that.