vibration @ 70mph

new tires have been balanced. Had front end aligned when after tires went on. I tried puttin it in 3rd and getting to the same rpm's and there was no vibration. only at 70+mph. I tried movin the driveshaft around and there was no play in it. Can somebody help a brotha' out here?:)

TIA

97 Blazer, 4wd

Vinnie-I have a 97 2 door.when i got my new tires there was a vibration.I had to bring it back 3 times.Being I have a short wheelbase you feel everything.If I was you recheck the balancing.It sounds like you got the vibration after the tires were installed. Hope this helps.

sorry should have posted that. i had the vibration before getting new tires.

Mie vibrates at 70 mph, it's a 4wd. I think Blazer vibrations are normal at those speeds.

Ya i agree with you... i have a 1995 suburban and it will start to viabrate at 80-90