1. Sourcing Parts: You'll need a complete automatic transmission assembly from a compatible 1998 S-10 or a very similar model year GM vehicle (compatibility is crucial). This includes:
* Automatic Transmission: The transmission itself, obviously. Make sure it's the correct type for your engine.
* Torque Converter: Connects the engine to the transmission.
* Transmission Computer (PCM/ECM): The Powertrain Control Module (PCM) or Engine Control Module (ECM) in the 1998 S-10 needs to be reprogrammed or replaced with one compatible with the automatic transmission. This is often overlooked but essential.
* Driveshaft: The driveshaft length likely needs to be adjusted or replaced, as automatic transmissions often have different output shaft lengths.
* Wiring Harness: You'll likely need to modify the wiring harness to accommodate the automatic transmission's electrical components.
* Automatic Transmission Pedal Assembly: You need the automatic transmission's gas and brake pedals and the linkage or cable for the throttle.
* Shift Linkage/Cable: The mechanism connecting the shifter to the transmission.
* Transmission Cooler Lines: If the donor vehicle had a transmission cooler, you'll need the lines.
* Fluid and Filter: New ATF fluid and filter for the new transmission.
2. Mechanical Work: This is the extensive part, requiring specialized tools and a high level of mechanical skill. It involves:
* Removing the Manual Transmission: This is a significant undertaking itself, requiring the removal of various components.
* Installing the Automatic Transmission: This is the reverse process of removal. Alignment and torque specifications are crucial.
* Driveshaft Modification/Replacement: As mentioned, this often requires adjustment or replacement.
* Wiring Harness Modification: This is complicated electrical work. Incorrect wiring can damage the transmission or other vehicle systems.
* Pedal Assembly Swap: The gas and brake pedals need changing.
* Crossmember Modification (Possibly): The transmission crossmember might need to be modified or replaced to accommodate the automatic transmission.
* Computer Programming/Replacement: The PCM/ECM must be reprogrammed or replaced to recognize the automatic transmission.
3. Professional Help: Unless you have extensive experience rebuilding and installing transmissions, this is a job best left to a professional transmission shop. The cost will be substantial, likely exceeding the value of many S-10s. Improper installation can lead to transmission failure, drivetrain damage, or even safety hazards.
In summary: Converting a manual S-10 to automatic is a very complex, time-consuming, and expensive project. It's usually far more cost-effective to simply find a used S-10 that already has an automatic transmission.
