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I recently purchased an 05 Excursion. 6.0 4x4
I am having a hard time diagnosing a highway speed vibration 55+.
This Excursion has the f250 leaf spring swap. 1-2 inches of total lift as a result. I am running Falken wildpeak AT 305/70r16 on a pro comp 16x10 wheels
I have had the driveshafts front and rear serviced, and balanced.
I replaced the trans mount
I ruled out tire balance as I had it checked on 2 different tire balance machines. An atlas economy machine and a Hunter roadforce balance machine. everything is perfectly balanced
Do you have a double cardan or two joint rear driveshaft (my 05 Excursion. 6.0 4x4 has a double cardan rear shaft).
The reason I ask is because the two type of shafts require different pinion angles to be vibration free after a spring swap/ lift. The make pinion angle shims to adjust the angle (they go between the leaf spring pack and the axle perch) , but it depends on what style rear shaft you have to determine what shim you want and here to put it.
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Do you have a double cardan or two joint rear driveshaft (my 05 Excursion. 6.0 4x4 has a double cardan rear shaft).
The reason I ask is because the two type of shafts require different pinion angles to be vibration free after a spring swap/ lift. The make pinion angle shims to adjust the angle (they go between the leaf spring pack and the axle perch) , but it depends on what style rear shaft you have to determine what shim you want and here to put it.
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I have a double cardan drive shaft in the rear at the transfer case. Can you or anyone refer me to a write up of instructions to properly measure the angle off of the rear diff and how to calculate the necessary shim?
With a double you want to compare the angle of the driveshaft with the angle of the differential pinion. For the pinion angle you can use the flat pinion plate as seen below to get your angle.
The angle numbers dont mean too much (as long as its not some crazy number). The main thing is your pinion angle is 2 to 1 degree less than your driveshaft. For example if you have an 8 degree driveshaft you want to have a 6 to 7 degree pinion. 3 degree than 1 to 2 pinion, like mentioned before the angle numbers are not to much of a concern more of the difference between the two.
There are tools to measure angles but i find my phone and angle app works just as well (have compared tool to app). The app will get you in the ballpark to see if this is the issue.
ok, so download the app in lieu of the angle finder tool, measure the angle of the shaft and on the pinion flange of the diff got it....
worst case scenario if i need shims where do I get them?
ok, so download the app in lieu of the angle finder tool, measure the angle of the shaft and on the pinion flange of the diff got it....
worst case scenario if i need shims where do I get them?
