Checking Driveling Vibration & Calculating It.

[Port&PolishMan]

Looking at these Numbers - allows - No Pinion Wrap Up . .

1. Eng. Trans . 3 Degrees Down ( Correction ) 3.3 Degrees Down !
2. 1st Drive Shaft Driven - Trig. Out the Angle to be 4.854 Degrees .
3. 2 sec. Drive Shaft Driven Trig. Angle to be 3.75
4. Rear Diff. Total = 3 Degrees Down.

Equals Operating Angles of :

Operating Angles of : 1st 1.55
2nd 1.1
3rd .75


Then Also :
*Taking into Acct. say 1 Degree ( Wrap Up ) for 1 ton Springs*

Looks like a Need to move Pinion at Least 1.0 Degree Down in Front . .
Or Add 1 Degree Shim to the ( Leaf Spring Perch ) - making Total Pinion = 2.0 Degrees Down
But the Operating Angle of 1.75 Degrees . .

Running down Road - I'd get . .

1st Operating 1.55
2nd Operating 1.10
3rd. Angle 1.25 Degree - which would allow approx .65 Degree Wrap Up .. Operating Angle of 1.75 Degrees

Hope I have this Sorted Out Now - Anyone Say ?
Corrected Type -O