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Model for 1991 Chevy truck transmission?

The 1991 Chevy truck transmission depended heavily on the engine and trim level. There wasn't one single transmission used across the board. To determine the correct transmission model, you need to know the following:

* Engine size: (e.g., 4.3L V6, 5.0L V8, 5.7L V8, 6.2L Diesel, etc.) The engine dictates which transmissions were available.

* Body style: (e.g., C1500, C2500, C3500, Silverado, etc.) Heavier-duty trucks typically had heavier-duty transmissions.

* Transmission type: Was it an automatic or a manual transmission?

Once you have this information, you can consult a repair manual specific to your 1991 Chevy truck or use online resources like a parts catalog (like those from GM or a reputable aftermarket parts supplier) using your VIN number. The VIN will definitively identify the original transmission installed.