[Hog]

Originally Posted by Hib Halverson

I am skeptical of Killebrew's information.

Back in the day, I spoke with Corvette development engineers about the 3.54 vs 3.45 debacle, one of them being my old friend, Jim Ingle.

All during development, the 3.54 axle had a noise problem. Chevrolet believed it would be a customer satisfaction problem once cars went on sale and pressed Dana to fix it. Turns out that the noise was inherent with the 3.54 ring-and-pinion's tooth count and, thus, could not be eliminated. Further development discovered a 3.45 ratio, with a different tooth count, could provide virtually the same performance but without the noise.

The idea that 3.54 axles went to countries with noise restrictions is ridiculous. Not only were rear ends with the 3.54 ratio noisier, but cars equipped with them would have noisier exhaust, too, because for a given vehicle speed, engine rpm would be higher.

No saleable ZR-1 was built with a 3.54 axle. Only the prototypes and some pilots got them, but that included some of the cars the media evaluated during the first round of magazine road tests, many of which were done with the '89s.

The loading of the engine also contributes to exhaust noise, which would be reduced with a lower gear, not rpm/speed alone.

But 3.54 to 3.45 no human ears would be able to tell the difference. __________________