Just running some rough numbers here, the vibration that was there occurred at 65 mph with a 3.31 ratio. With the new 3.73 ratio there is a vibration at about 52 mph. With a 275/40r18 tire, 65 mph is about 2700 shaft rpm with the 3.31. 2700 rpm of the shaft is about 45 hz. With the new 3.73 ratio, 52 mph is about 2440 rpm or about 40 hz. Might be the same vibration source that's now occurring lower in vehicle speed due to the ratio change. How well does the slip yoke fit in the trans. Any slop? U joints feel free to pivot?
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