Here's why it's complex:
* Transmission itself: Obviously, you need a manual transmission from a compatible 1999 Ford Ranger 3.0L V6. Finding one in good condition might be challenging.
* Clutch assembly: This includes the clutch disc, pressure plate, throw-out bearing, and related hardware.
* Clutch pedal assembly: You'll need the pedal, linkage, hydraulics (master and slave cylinders), and possibly modifications to the firewall and floorboard.
* Bellhousing: The bellhousing that connects the engine to the transmission is different for automatic and manual transmissions. You'll need the correct manual bellhousing.
* Driveshaft: The driveshaft length might be different, requiring a new one or modification of the existing one.
* Wiring harness: The wiring harness for the automatic transmission will need to be altered or replaced to accommodate the manual transmission's needs (shift interlock, etc.).
* Computer/ECU: The PCM (Powertrain Control Module) may need to be reprogrammed or replaced, depending on the year and specific options of the donor manual transmission vehicle. This is often overlooked, but very important.
* Shift linkage/cables: You'll need the proper linkage or cables to connect the shifter to the transmission.
* Crossmember: The transmission crossmember may need to be replaced or modified to accommodate the manual transmission.
In short: This isn't a weekend project. It requires significant mechanical expertise, specialized tools, and access to parts. Unless you're experienced with automotive mechanics, it's strongly recommended you seek the help of a professional mechanic specializing in transmissions. The cost of parts and labor could easily exceed the value of the truck if you're not careful.
