Do you have to remove engine replace transmission in a 2002 dodge grand caravan sport?

No, you generally do not have to remove the engine to replace the transmission in a 2002 Dodge Grand Caravan. While it's a somewhat involved job, it's typically possible to access and replace the transmission with the engine remaining in the vehicle. However, access might be easier with certain components removed (like some engine accessories) to create more working room. Many mechanics will accomplish this without engine removal.