Hey, finally someone with the same prob. My 92 notch and my 91 notches gave me the exact smae prob. balanced the driveshaft replaced the tranny mounts, and it never got better. no doubt its in the tranny. I just bought a Mach 1 w/9000 miles on it and at around 80mph the vibration comes in and then it suddenly smooths out at around 110!!!WTH is going on. Ive cracked 2 tailshafts in 3000miles and now ford doesnt want to replace it without and engineer coming out. I cant wait to hear the high tech over my head BS they are going to try and pull on me! anyways Ill let you know when and if I get the prob resolved.
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