* Engine: The transmission must be compatible with the engine in your 98 Ram 1500. A transmission from a V6 won't work in a V8, for example. Even within the same engine family (e.g., both 5.2L V8s), there might be slight differences that cause incompatibility.
* Transmission type: You need to match the *type* of transmission (e.g., 3-speed automatic, 4-speed automatic, 5-speed manual). Just because they're both Dodge Rams doesn't mean they used the same transmissions.
* Transfer case (if 4x4): If both trucks are 4x4, the transfer case needs to be compatible with the transmission.
* Wiring harness: The electrical connections might need modification or might not be compatible.
In short, you need to identify the exact transmission model in both trucks (e.g., 46RH, 47RH, NV3500, etc.) This information is usually found on a tag on the transmission itself. Once you have the exact model numbers, you can research online to see if they are directly interchangeable. Even with matching numbers, there's a chance of minor differences that could create problems. It's best to consult a mechanic or a parts professional specializing in Dodge Rams to verify compatibility before attempting the swap.
