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Guys With Expo 8.8 Need Your Help!

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Old 09-03-2009
RangerJacoby99's Avatar
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Guys With Expo 8.8 Need Your Help!

so ive been having a driveshft issue since i installed the axle. I read on trs about the pinon angle, and that it should be set to 6 degrees. well i went out and measured the angle once again, and im sitting at about 10 degrees. so i think that might be the reason im getting this vibration from the driveshaft. So i was wondering if i got 4 degree shims would this fix the issue? thanks!
 
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Old 09-03-2009
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I wouldn't shoot for 6* unless you have actually measured the over all pinion angle. The 6* suggest on TRS should be considered a starting point, but every truck is different. The proper way to measure overall pinion angle is the difference between the driveshaft angle and the tail housing of the trans or Tcase should be the negative of the difference between the driveshaft angle and the pinion flange.

So lets say the tailhousing measures 78* and the driveshaft reads 75*. So that would be a 3" difference. Then the pinion flange reads 71*, so the difference is -4. Add up the two difference's to get an over all pinion angle 1*. You are typically shooting for o* overall pinion angle, but under 2 is "usually" acceptable. Sorry its hard to explain online.

Here is a quick pic I found online.
 
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Old 09-03-2009
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that helps alot thanks man!
 
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Old 09-03-2009
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NP. If you need any more help shoot me a PM. Its just hard to describe on here.
 
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