Important Considerations:
* Engine: The transmission must be compatible with the engine's torque and power output. A transmission designed for a smaller engine might fail under the stress of a larger V8.
* Transfer Case: The transmission's output shaft and bolt pattern must match your transfer case (the component that sends power to the front and rear axles). This is a crucial factor for compatibility.
* Computer Control: Automatic transmissions are heavily reliant on the vehicle's computer system. A direct swap might work, but you might need to address compatibility issues with the PCM (Powertrain Control Module) to prevent problems. Manual swaps usually require more extensive modifications.
* Wiring Harness: The wiring harness for the transmission and its sensors needs to be compatible.
* Driveshafts: Driveshaft length might need adjustment depending on the transmission.
Specific Interchangeability:
* 46RH to 46RH: The most straightforward swap is another 46RH of the same year range. Even then, minor differences might exist, and you should confirm the bellhousing bolt pattern is identical.
* 46RE (later model): While similar, the 46RE (used in later Grand Cherokees) is *not* a direct bolt-in replacement for the 46RH. Significant modifications would likely be required.
* Manual Transmission (AX-15): Swapping to an AX-15 is a very complex undertaking. It requires major modifications, including potentially the clutch, bellhousing, flywheel, pedal assembly, wiring harness, and possibly the driveshafts. This is generally not a recommended undertaking for someone without extensive mechanical experience.
Before you even consider a swap:
1. Identify your current transmission: Definitely confirm which transmission you currently have (46RH or AX-15).
2. Find a replacement: Locate a used transmission from a similar-year Grand Cherokee with the same engine and transmission. This significantly increases your chances of success.
3. Professional Installation: Unless you are a very experienced mechanic, having a professional perform the swap is highly recommended. A transmission install is a complex procedure.
In short, there's no simple "interchangeable" list. The most likely successful swap is a 46RH from a similar-year Grand Cherokee V8. Any other swap requires considerable expertise and potentially custom fabrication. Researching specific transmission codes (found on the transmission casing itself) will significantly help in finding a suitable replacement.
