Nissan Sentras with 1.6 Liter engines (GA16DE) use a different Transmission from the altimas. Automatic Altimas use the RE4F04A while 1993 Sentras used RL4F03A or V. To make this swap work, You might need to swap the transmission as well. In the US, this engine was not common in Sentras made after 1990, so it would be hard to find. The Sunny, the non-US version of the Sentra used this engine until the early 2000's. For me, in the US, it would be easier to find another KA24DE and use my existing trasmission than to pull a SR20DE engine and Transmission out of a Sentra along with the axles, and ecu, and still have to modify the wiring to make it run.