Was wondering if anyone could tell me what all ,
transmissions would fit a 2007 lacrosse with 3.8.
thank you.

2006, 2007, 2008, 2009, 2010, 2011 4t65e transmissions with the same final drive ratio. There is a POSSIBLY part differences but it should only be a matter of the right TCM and programming to the car Id think.

2005 and older 4t65e require a lot of changes to be made to work for yours. 2006+ should be good. a 2005 la crosse SHOULD NOT be used for donor, they may not have a TCM and thus the old stuff. Possibly.