Here's what you need to consider:
* Transmission Type: Identify the exact transmission in both cars (e.g., TH350, TH200-4R, Turbo Hydra-Matic 200-4R). Even if both are, say, TH350s, there might be subtle differences in mounting points or bellhousing patterns over those four years.
* Bellhousing: This is the most crucial part. The bellhousing connects the transmission to the engine. A mismatch here will prevent the transmission from bolting up. The engine type in each car also affects the bellhousing compatibility.
* Crossmember: The transmission crossmember supports the transmission in the chassis. The 79 might not have the correct mounting points for the 83 transmission's crossmember. Modifications might be required.
* Driveshaft: The driveshaft length might be different and need adjustment or replacement.
In short: While the *chance* is there, especially if both cars have the same transmission type, you should not assume it's a simple bolt-in swap. You need to do thorough research on the specific transmissions involved (including checking the transmission identification codes on the units themselves) and potentially consult with a transmission specialist or experienced mechanic before attempting the swap. Expect some fabrication or modification work to be necessary.
