Re: Vibration dampeners for 66-67 cars?

[Tom Jennings <tomj@xxxxxxx>]

On Wed, 13 Apr 2005 farna@xxxxxxx wrote:

> I researched the proper way to set the driveline up. Basically, you can be out of alignment with no problems AS LONG AS angles on both ends are the same. If the shaft is 3* downhill from the centerline of the trans then it needs to be 3* uphill from the centerline of the axle. Longitudinally is the same -- same angles on both ends are good. On live axle cars the angle at the axle changes since the entire axle moves up and down and twists with torque. Up and down the angles should change together, but twisting the rear (especially with leaf springs) doesn't change the front. So most manufacturers have the rear angle around 1* lower since the axle will twist when power is applied. Since I have a rear trans seal leak now I'm thinking the driveshaft might be out of balance. It was shortened slightly when the new end was put on to match it to the Jag rear axle.

Of course -- it was so long ago (back in my autocross days) I'd
forgot all the reasoning.

The rear axle swings up in an arc, so the driveline angle changes
(plus the torque issue) so it's set statically such that at each
extreme it stays reasonable.