Thread: Vibration problem solved

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The advice from companies making driveline components is that if you extend a line through your transmission output shaft toward the rear, and another through your pinion shaft extending toward the front those two lines will be parallel. With the line of the driveshaft between the two lines, the angles from the two lines to the driveshaft will be equal and opposite, tranny down, pinion up. Dave Severson posted not too long back that for a leaf spring rear suspension, which tends to "wrap" a bit under power (pinion rising) he likes to bias in about two degrees of differential on the pinion so that it equals out driving down the road. That is, say the tranny to driveshaft angle is 3 degrees down, he'll want to see about one degree up tilt on the pinion static, measured from the pinion line to the driveshaft. There are a ton of drawings out there showing the proper relationship, like from Inland Empire - http://www.iedls.com/asp/admin/getFi...&TID=28&FN=PDF