* Transfer Case: The 2002 4x4 will have a transfer case integrated into the drivetrain, which the 2WD transmission lacks. The 4x4 system requires a specific output shaft and gearing that's not present on the 2WD transmission.
* Output Shaft: Even if you could somehow ignore the transfer case, the output shaft length and spline count will likely be different, making it impossible to connect to the 4x4's driveshafts.
* Internal Gear Ratios: While not impossible, the internal gear ratios might be significantly different, leading to issues with speedometer accuracy, engine RPM, and overall drivetrain performance.
* Mounting Points: The transmission's mounting points on the engine and frame are very likely different.
In short, while some parts might be *similar*, the fundamental design differences between a 2WD and 4WD transmission, particularly across such a significant model year gap, make this swap highly improbable and impractical. You'd need a transmission specifically designed for a 2002 Dodge 4x4.
