Join Date: May 2001
Location: Long Island Again
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Re: Driveshaft Spacers or Shims or Both ??
To cure the vibes you need to find out your angles.
Start by rotating your drive shaft so the ends that attach to the flanges are flat to where you can put the protractor on.
Next put the protractor on the tcase end record the degree then the center of the driveshaft record the degree then the pinion end and record the degree.
Now subtract each flange ends from driveshaft to get each working angle, then subtract the working angles it should be 0 to 1* anything more will create vibes.
[ ] = flange
x = Ujoint
--- = driveshaft
8* 12* 7*
12-8=4* upper Ujoint working angle(should be between 1*&7*)
12-7=5* lower Ujoint working angle
5-4=1* Parrallel compensation angle(vibration angle)
9* 13* 12*
4-1= 3* = vibes
In the case of this you would use shims to decrease the pinion angle. Now, if youuse shims to decrease the pinion by 2* that will now add 2* to the driveshaft, so as a rule if you subtract from one you add to the other, and vice-versa.
Bad angle Fixed
9* 15* 10*
6-5= 1* = good enough