* Different Bellhousing: The TH350 and 700R4 use different bellhousings. You'll need a 700R4 bellhousing that matches your 350 engine's bolt pattern.
* Torque Converter: You'll need a torque converter specifically designed for the 700R4 transmission and your engine. The TH350 converter won't work.
* Length: The 700R4 is longer than the TH350. This might require modifications to the driveshaft, possibly shortening it. You might also need a different transmission crossmember.
* Electrical Connections: The 700R4 is electronically controlled, unlike the TH350, which is usually mechanically controlled. This means you'll need to wire the 700R4's electrical components into your truck's wiring harness. This often requires a wiring harness adapter or custom wiring. You might need a shift kit to control the transmission's function if you intend to use the original column shifter.
* Computer Control: The 700R4's operation is controlled by the vehicle's computer (PCM) through the transmission's shift solenoids. You'll need to ensure your PCM is compatible with the 700R4, or you might need a custom tune or aftermarket controller to properly manage the transmission's shifting.
* Cooling: The 700R4 generally requires a transmission cooler, which your truck might or might not already have. If it doesn't, you'll need to install one.
In summary, while the swap is possible, it's a significant undertaking that requires mechanical knowledge, specialized tools, and potentially custom fabrication. It's not a job for a novice. You'll likely need a shop manual specific to your truck and the 700R4 transmission to guide you through the process. Consider the cost of parts and labor before attempting this swap.
