Here's a breakdown:
Costs:
* Transmission: Finding a used manual transmission in good condition for a 1999 Civic can be challenging. The cost could range from $500 to $1500 or more, depending on availability and condition.
* Clutch assembly: This includes the clutch disc, pressure plate, throw-out bearing, and related components. Expect to pay anywhere from $300 to $800.
* Clutch cable or hydraulics: Depending on the year and model, the Civic may use a cable or hydraulic clutch system. Replacing this will add another $100-$300.
* Flywheel: This might need resurfacing or replacement, adding another $100-$200.
* Shifter assembly and linkage: You'll need the manual shifter, linkage, and related parts. This could cost between $200 and $500.
* Labor: This is where the cost really climbs. A professional mechanic will charge significantly for the extensive labor involved in this conversion – likely several thousand dollars, considering the complexity of removing the automatic transmission, installing the manual transmission, and modifying the car's linkages and potentially the driveshaft. It's a very time-consuming job.
* Other potential costs: There might be unforeseen issues, like needing additional parts or modifications to the car's chassis or wiring harness.
Total Estimated Cost: A realistic estimate for a professional conversion could easily range from $2500 to $5000 or more.
Benefits:
* Better fuel economy (marginal): You might see a slight improvement in fuel economy, but it's unlikely to be significant enough to offset the conversion cost.
* More engaging driving experience: Some drivers prefer the more engaging experience of a manual transmission. However, this is subjective.
Why it's usually not worth it:
* High cost: The cost of the conversion drastically outweighs the potential benefits for most people.
* Complexity: The conversion is a very involved process requiring significant mechanical skill and expertise.
* Depreciation: The value of your car is unlikely to increase by the amount you spend on the conversion.
Alternatives:
If you want a manual transmission, it's generally far more economical and sensible to simply buy a 1999 Honda Civic that already has a manual transmission.
In short: Unless you have extensive mechanical skills and enjoy working on cars, the conversion is almost certainly not worth the investment. The money spent would be better used purchasing a different Civic with the transmission you desire.