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Can you put a rearend out of 2002 dodge ram 1500 4x4 in 2001 4x4?

Yes, a rear axle assembly from a 2002 Dodge Ram 1500 4x4 is generally compatible with a 2001 Dodge Ram 1500 4x4. However, there are some caveats:

* Axle Ratio: Make sure the axle ratio (e.g., 3.55, 3.92, 4.10) is the same or very close. A significant difference will affect your speedometer accuracy and engine performance.

* ABS Sensors: The ABS sensors might be slightly different. You may need to use the sensors from your old axle or ensure the new sensors are compatible.

* Wiring Harness: The wiring harness might require some minor adjustments to fit perfectly.

* Brake Lines: Brake lines may need to be modified or replaced to fit the new axle.

In short, while it's *likely* a direct swap, double-check the axle ratio is the same. You might encounter minor differences in sensors and wiring that require some adaptation. It's always best to compare part numbers to be certain. If you're not comfortable with automotive repairs, it's advisable to consult a mechanic.