Hi folks, this is my first time on this forum so, I am in conyers ga, I have completely restored 57 hard top, a 57 conv, a 40 ford coupe. The Conv and 40 are long gone, I only have the hard top now and it's been in the family 30 years now with on 23k miles on it. As you know I'm sure, you never get through with them. I have recently put a new 350,290 sbc in it and just put a Tbi on it which I really like. Now the problem, I have just recently put a 700r4 in it and I have a vibration at exactly 70 mph. I have had the tires rebalanced, they are 15 inche by the way, replaced one rear axle bearing and had the drive shaft rebalanced. Nothing seems to help, has anyone else had this problem. Any help would be greatly appreciated.