* Electronic Control vs. Mechanical Control: The 4L60E uses an electronic control system integrated with the vehicle's computer, while the 700R4 uses a mechanical governor and linkage. This means the 700R4 won't be compatible with the 1996 Chevy's wiring harness and computer.
* Different Torque Converter: The torque converters are different sizes and designs, incompatible between the two transmissions.
* Mounting Points: While there might be some overlap, the mounting points and bellhousing pattern may not be exactly the same, requiring significant fabrication or adapter plates.
* Shift Linkage: The shift linkages and mechanisms are completely different.
In short, while you might *theoretically* be able to make it work with extensive modifications (custom driveshaft, wiring harness changes, custom bellhousing, potentially computer reprogramming, etc.), it would be a very complex and expensive undertaking, far exceeding the cost of finding a correct 4L60E transmission. It's not a practical swap. Sticking with a 4L60E is the vastly simpler and more cost-effective solution.