Drive shaft vibration?

Shift518 Automotive
21

Truck must absolutely be level and suspension loaded.

The best way to get the most accurate measurment is to take a flat place of steel or machinist granite stone and place it up against the end of the yoke(DS removed) and put the angle finder to that. Subtract 90 degrees from your findings(or rotate the gauge bezel if your finder is so equipped.) Do the same for the spline on the tranny(most stick out a tiny bit to do the process above in similar fashion)

Measuring off the casing of the rear end can be off a few degrees pending surface condition(rust, oxidation, flash, etc) and whether that surface you’re measuring from is actually perfectly parallel to the yoke centerline to begin with.

22

Here is where i got the idea to check DS.

http://www.drivelinespecialist.com/Tech1.htm

23

whether that surface you’re measuring from is actually perfectly parallel to the yoke centerline to begin with.

Are you refering to the axle being straight so rear yolk is even to the front.

24

Sorry, what I should have said was the surface where you are placing the magnetic degree indicator on. I know alot of people that mess this process up and get inaccurate readings because they measure off the outer case of the rear end, or transmission, vs the actual yoke/spline itself.

Example…rear end.

-Drop the drive shaft and remove the u joint clamps from the yoke completely
-Wire brush and scrape clean the end face of the yoke where the joint band clamps bolt into the yoke.
-Using a clean flat piece of steel plate(or better a machinist granite) place the plate against the end face of the yoke and put the degree indicator up against that to get your angle measurement. That will get you the true reading of the yoke angle, not the rearend case angle which may or may not be exactly the angle of the yoke.

25

That is where i measure and used a steel ruler i have and the magnetic angle finder,thats where i came up with the -3*.

Your avatar is awsome.

26

I attached a picture…red line indicates the line you should measure angle from(using plate or granite + indicator)

27

Ok good, ruler work too as long as it doesn’t flex and stays perfectly flat for you.

28

So now i just have to scrap the drivesahft measure ment and do the front.leave driveshaft in for that too or no?

29

After i get that front measure what do i subtratc from what?I appreciate all your help fellas specially that the shims arent alot of denaro.

30

Well it all depends. If you have a true inclinomoeter you can do it all in one shot w/o dropping the DS. I use a basic angle finder, and do the steps above to get the yoke and tranny output angles. You do need the DS angle to get a complete setup though so if it was accurate don’t scrap your reading.

If you don’t have a flat plate to get the reading off the yoke, a deepwell socket the size of the joint beaing caps works as well. Lock into the yoke with one of the bands and put the angle finder upt o that to get your reading. you should use that if the yoke is severely corroded/rusted