tire problems

my new b.f goodrich t/a 16 inch lt tires are vibrating my truck. i took the truck back and they rebalanced and i am still getting vibration from tires at 40 mph.i lifted up the tires off the ground and you could see the tires vibrating at 40 mph on jacks. can anyone tell me whats going on?

Did you change wheels at the same time?

we checked all the rims.all good.there was 3 bad tires brand new.goodrich lt 245/75 16 raised letter.i had them take them off and put on michlin lt tires. my chevy truck ran almost like a caddy home.it was tires. 1 thing i noticed. some of the tires when balance had as much as 4 and 1 half ounces on the rims to balance. the michlins had arounf 1 once on each one. my mechanic noticed that and said maybe that is telling us something. i never saw so many bad tires as there are today. they were lined up at sears returning tires for vibration. the worst ones i heard were goodyear, dunlop, general ,goodrich,.the best michelins, cooper and a lot wanted firestones but no one carried them . it seems that goodyear was the worst i heard from people there.i could not believe that a tire could shake a car at 40 mph so bad.well, maybe this will help others. :wink: