* 4T65-E 4-speed automatic: This was the most common transmission. Many GM cars from this era used this transmission. Finding exact matches is difficult as the application varied slightly by year and engine but many GM vehicles from 1997-2006 used this transmission. You'd find it in various Buick, Oldsmobile, Pontiac, and Chevrolet models.
* 4T60-E 4-speed automatic (less common): A less common option, possibly only with specific engine options or trim levels. This transmission also saw use across various GM vehicles during a similar timeframe.
To be certain which transmission your specific 2001 Buick LeSabre has, you should check the vehicle's identification plate (usually located on the driver's side dashboard or doorjamb), your owner's manual, or consult a repair manual specific to that year and model. The transmission code will be listed there. Without that specific code, only general makes and models that *may* have shared the same transmission can be suggested.
