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I need to know how to remove the transmission in a 2003 Nissan Altima 2.5 liter 4 cylinder and replace it with a new one are used1

Hi Lamont! You might find the answer on this question helpful: auto trans remove and replace

Hi @ Jr Brantley, Here’s a link to the automatic transaxle repair section from the service repair manual for a 2001-2002 Nissan Altima. Scroll to p.AT-15 to view the location of the TCM (transmission control module) if this is what you mean. It is in the same location for a 2004-2005 Nissan Altima so presumably it will be the same for the 2003 model.