* Different Lengths: The TH350 is significantly shorter than the 700R4. This means the driveshaft will be too long. You'll need a shorter driveshaft.
* Transmission Crossmember: The crossmember that supports the transmission will need to be modified or replaced to accommodate the shorter TH350.
* Computer Control: The 700R4 is electronically controlled by the car's computer. The TH350 is typically mechanically controlled. You'll lose the electronic shift control and likely need a different control system. This can be more challenging than it seems.
* Torque Converter: The torque converter for the TH350 will be different than the 700R4. You'll need to source the correct one.
* Shift Linkage: The linkage is different, so you'll likely need to fabricate a new shifter linkage or adapt the existing one.
In short, while it's *possible* to install a TH350, it's not a simple swap. It requires significant mechanical skill and fabrication work. Many consider it more trouble than it's worth, especially considering the performance advantages of the 700R4's overdrive gear. If you're not comfortable with significant transmission work, it's best to stick with a rebuilt or replacement 700R4.
