can put automatic engine manual car

[MacArianna]

Yes, it is technically possible to swap an automatic engine into a manual car, but it is a complex, expensive, and often impractical project that is generally not recommended for the average car owner. The primary challenge isn't the engine itself, but the integration of the different transmission control units (TCUs) and wiring harnesses. An engine from an automatic car is designed to communicate seamlessly with its specific automatic transmission. Retrofitting it to work with a manual gearbox requires extensive custom fabrication, rewriting of the engine's computer (ECU), and potentially modifying the engine block to accept a manual transmission bell housing and clutch components.

The feasibility and cost depend heavily on the specific vehicles involved. A swap between two models from the same generation of a car (e.g., taking an engine from an automatic Honda Civic and putting it into a manual Civic) is more straightforward than a cross-brand swap. Common hurdles include:

• ECU/TCU Integration: The manual car's ECU expects certain inputs (like a clutch pedal sensor) that the automatic engine's ECU doesn't. You may need a standalone engine management system.
• Driveshaft and Axles: The manual and automatic transmissions may have different output shafts, requiring a custom driveshaft or axles.
• Mounting Points: Engine and transmission mounts are often in different locations.

For popular project cars, aftermarket support with conversion kits can make the process easier. However, for most daily drivers, the labor and parts cost will far exceed the car's value. A more sensible path is to either buy a car with the desired transmission from the factory or perform a manual transmission swap on an automatic car, which often has better aftermarket support.

Consideration	Estimated Cost Range	Complexity Level	Common Application
Same-Model Swap	$2,500 - $7,000+	High	Project cars with blown manual engines
Cross-Model Swap	$5,000 - $15,000+	Very High	Custom builds, race cars
Aftermarket Kit Availability	Varies significantly	Medium (with kit)	Popular models (e.g., Honda, Ford, GM)
Professional Labor Hours	20 - 60+ hours	N/A	Major factor in total cost
ECU Reprogramming/Replacement	$500 - $2,500	High	Critical for engine to run correctly

[SanArabella]

From a pure nuts-and-bolts perspective, the engines themselves are often very similar. The big issue is the computer. The engine from an automatic is programmed to talk to an automatic transmission. You're looking at a ton of custom wiring to make it listen to a manual gearbox and a clutch pedal. It's a puzzle for expert mechanics, not a weekend DIY job. Honestly, if you want a manual, just start with a manual car.

[StIan]

I looked into this for my old truck. My mechanic told me straight up: the amount of custom fabrication and computer work needed would cost more than the truck is worth. He said it's smarter to either sell the manual car and buy an automatic, or if you're set on a manual, find one that already has the engine you want. It's one of those things that sounds simple but turns into a money pit really fast. I ended up just keeping my manual as-is.