* Specific Cavalier model year: Even within the Cavalier's production run (roughly 1982-2005), different years had different engine sizes and transmission types (manuals and automatics of varying designs).
* Transmission type: You need to know if you're dealing with an automatic or manual transmission. Automatic transmissions are further categorized by the number of speeds (3-speed, 4-speed, etc.) and their internal design (e.g., specific GM transmission codes like 700R4, etc.). Manuals also vary by gear ratios and overall design.
* Engine size and configuration: The transmission must be compatible with the engine's torque output.
To find compatible transmissions, you'll need to specify the *exact* year, model, and engine of your Chevy Cavalier. Then, you can consult a parts catalog (like those available from auto parts stores or online) or a repair manual for that specific vehicle. These resources will list the correct transmission part numbers.
Trying to use a transmission from a different year or model without verifying compatibility is risky and could lead to serious mechanical problems.