Interchangeable parts for 02 Buick LeSabre

Lots of motor, 3.8l 3800, parts and suspension parts will fit from a park avenue. If its motor parts there are bunches of gm models will fit

Will a 3.8 Buick trans interchange aith a couple Chevy 3.1

A 3.1 has a differrnt gear ratio. You need to know the year of the chevy cause even tho the model of the transmission is the same, the electronics were switched around in different model years. The build sheet that your car has will tell you the gear ratio. You can then hunt for any gm with that ratio and that will fall into the group of years where the wiring is correct for your car. If you want an easy reference use car-part dot com an look for what cars it shows for your replacement. Remember to match the gear ratio.