However, some common transmissions found in 1991 Suburbans include:
* TH700R4 (or 4L60): This 4-speed automatic was very common in various engine combinations. This is likely the most common transmission you'll find parts for.
* TH400: A 3-speed automatic, less common in 1991 but still possible depending on the engine and trim level.
* SM465: A 4-speed manual transmission. Finding parts for this might be more challenging.
* NV4500: A 5-speed manual transmission, less common than the SM465 but also a possibility.
To find the correct replacement:
1. Identify your engine: The engine code is usually stamped on a plate on the engine block. This is crucial.
2. Check your transmission: Look for a tag on your existing transmission for the identification code.
3. Consult a parts catalog: Use a parts catalog specific to your year and model Suburban, providing both the engine and transmission codes. This will show you which transmissions are officially compatible.
4. Consult a transmission specialist: A local transmission shop can provide expert advice based on your specific situation and offer compatible options. They can also help with installation.
Simply putting in *any* transmission will likely not work. The transmission needs to be compatible with the engine's torque output, bellhousing bolt pattern, and the driveshaft length/angle. Improper installation can lead to significant drivetrain damage.
