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Any updates on this issue. I have a 74, k20 350 , 350 trans with same problem. New tires, new ujoints, new drive shaft. Had the back cover off of the rearend no obvious wear patterns. PO did replace 203 with a 205. After replacing extremely loud exhaust with a stock exhaust I noticed it does it also when I press the gas pedal all the way to the floor. It appears the heavy vibration( imbalance) is when the engine is under load. This morning I was in 3 gear and started feeling it at about 55, I down shifted to 2nd and imbalance speed up. This confirms it is not in the tires. Any help is appreciated, even WAG's

Thanks Mike
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