How long do U Joints usually last?

On average how many miles can you put on your U Joints before they fail? Or need Changed?|||i dont think they have an average....if you drive a car right and dont do stupid things in it from the factory the stock u joints can last the whole car/trucks life...but if you have you replace them you usually never have to worry about them again except if you have a tune up they might shoot some grease in the fittings....i wouldn%26#039;t worry about every replacing them unless you run a towing business and constantly punching the gas and basically over torquing your driveshaft...if you are ..i%26#039;d suggest stopping that b/c you can rip apart your rear end ;)|||If you have a lower quality car and im not going to spark a storm so i wont choose car companies but you can look it up. Your U-Joint might be made cheaper or less quality. If you previously bought the car from someone else who overworked his Driveshaft with a lot of towing. These are the only things i could think of and it shouldnt be a problem even with these factors till 150k +. Since i repeated some of the other guys stuff in a different way make sure he gets best answer.|||Never changed one yet in 40+ years on umpteen vehicles, why do you ask? Wot%26#039;s the problem?