The transmission choice depends heavily on the specific Chevy V8 you choose and your desired performance characteristics. There isn't one single "right" transmission. Popular options and considerations include:
* TH400 3-speed automatic: A strong, reliable, and relatively simple option, though somewhat dated technology. It's a common choice for V8 swaps in Jeeps because of its robustness. You'd likely need an adapter to mate it to the Chevy V8.
* TH700R4/4L60E 4-speed automatic: A more modern automatic offering better fuel economy and smoother shifting than the TH400. However, it's less robust and may require reinforcement for off-road use with a V8. Again, an adapter is necessary.
* SM465 4-speed manual: A durable and popular manual transmission choice for Jeep V8 swaps. It's known for its strength, but its shifting can be somewhat clunky. Requires an adapter.
* NV4500 5-speed manual: A stronger and more modern manual option than the SM465, offering better gearing for highway driving. It's also a more challenging swap. Requires an adapter.
Key Considerations:
* Engine Mounts: You'll need custom engine mounts to position the Chevy V8 correctly in the Jeep's engine bay. This often involves significant fabrication.
* Transmission Adapter: An adapter plate is essential to connect the Chevy V8 to any of the transmissions listed above, as the bolt patterns won't match.
* Driveshafts: The driveshafts will likely need to be custom-made or significantly modified to accommodate the new engine and transmission.
* Exhaust System: A custom exhaust system is necessary.
* Wiring Harness: You'll need to adapt the Chevy engine's wiring harness to work with the Jeep's electrical system.
* Cooling System: The Jeep's stock cooling system may be insufficient for a V8. You might need a larger radiator and possibly an electric fan.
* Transfer Case: Consider if you need a stronger transfer case than stock to handle the increased power.
In short, this isn't a project for beginners. It requires significant mechanical skills, welding experience, and access to fabrication tools. Professional assistance is strongly recommended unless you have extensive experience with engine swaps and Jeep modifications.
