I have a buick lesabre 1997 when i drive long way the transmation gets hot and start ripping and i have to put it in lower gear

If you mean your transmission starts slipping. First thing you should always do. Check your transmission fluid levels, if your transmission fluid is low, use the proper amount of fluid right away. If this takes care of the problem, then I would highly recommend keeping a close eye on your transmission fluid levels from now on. Always keep plenty of Dextron 3 automatic transmission fluid on hand so you can top of the transmission if the dip stick is showing the slightest indication that your getting low. Fluid levels should touch the top line on the dip sticks level indicator. For best result check the transmission fluid levels when you first start the engine up for the day.

If it's been 35.000 miles since your transmission was last serviced, it may be due time to have a transmission flush and filter replacement.

Take care of the problem now, while you have a chance of saving the transmission, so it will not lead to costly replacement.