Can you put a dodge charger hemi engine in stock v6 Chrysler 300 and still use the same transmission?

No, you cannot directly swap a Dodge Charger Hemi engine (typically a 5.7L or 6.1L/6.4L) into a stock V6 Chrysler 300 and use the same transmission. The V6 Chrysler 300 uses a transmission that's not designed to handle the significantly higher torque and horsepower of a Hemi engine. You'd need a much stronger transmission, likely an automatic from a higher-performance model with the Hemi engine already.

Even beyond the transmission, other modifications would be needed:

* Engine Mounts: The Hemi engine is physically larger and heavier; the existing engine mounts won't work. Custom mounts would be required.

* Wiring Harness: The Hemi's engine control module (ECM) and wiring harness are different. Significant rewiring or an aftermarket harness would be necessary.

* Driveshaft: The driveshaft may need to be replaced or modified to accommodate the Hemi's larger torque output.

* Exhaust System: The exhaust system will need to be replaced to fit the Hemi.

* Cooling System: The Hemi produces more heat, so the cooling system might need upgrades, including a larger radiator.

* Axles: Depending on the Hemi's power, the axles might need to be upgraded to handle the increased torque.

In short, while it's *theoretically* possible, it's a very extensive and costly project requiring significant mechanical expertise and custom fabrication. It's far beyond a simple engine swap.