* Year and Model: Different years had different transmissions, some more reliable than others. The specific transmission type (e.g., 4T65E, 4T60E) significantly impacts longevity.
* Driving Habits: Aggressive driving, frequent hard acceleration, and towing (if applicable) will shorten the transmission's life.
* Maintenance: Regular fluid changes and filter replacements are crucial. Neglecting maintenance is a major contributor to premature transmission failure.
* Driving Conditions: Lots of stop-and-go traffic puts more stress on the transmission than highway driving.
* Previous Repairs: A poorly repaired transmission may not last as long as one that's been properly maintained.
While some Grand Prix transmissions might last 150,000 miles or more with proper care, others might fail much sooner due to any of the factors listed above. It's not uncommon for transmissions to require repair or replacement somewhere between 100,000 and 200,000 miles, but this is just a broad range. There's no guaranteed lifespan.
