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I think handana's reference to "economy rear end ratio" meant he had the optional 2.80 gears, data plate code 6. Some years ago, I had to have my rear end replaced and the only thing I could find that was available at a reasonable cost was a 2.88. A little slower off the line, but better fuel economy at speed. Since I have headers, a Cobra Sidewinder manifold and large Edelbrock carb, I have no trouble from a standing start anyway and I have my fuel consumption up to almost 11.
Gary, your observations about the improvement in ride with the new rear end components is interesting since that vibration at 45 to 55 mph is fairly common. Everyone I've talked to about it considers it a front end problem, but maybe it's axles/springs.
Just some thoughts
Terry
64HT
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