GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

Pinion angle...and i have used the search button!

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Old 04-14-2009 | 07:53 AM
  #11  
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use an angle finder... mines set at about -3.5 drgrees
Old 04-14-2009 | 08:38 AM
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Originally Posted by lucky77
you need 1 of these . magnetic one . . you placed it on th yoke . make sure your truck is parked on a straight* your angle should be - 2 or close. .. like -3 or -1 . .so when u floor it it's at a perfect angle 0 . . you could also place the angle on the driveshaft where its parallel . . . i'll post some pics later on so u can have an Idea' if ur angle is positive , you need Shims' .
i ordered one of those exact tools.

Dustin
Old 04-14-2009 | 06:23 PM
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yep, 2-3* you tranny should point down 2-3*, which it does since it's stock. And you're rearend should point up 2-3* this allows the ujoints to use all there designed movement, and minimize vibration and potential ceasing
Old 04-15-2009 | 01:14 AM
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Being a stick with 4.11's, -4* or more might work better for you...that's assuming you hook up.
Old 04-15-2009 | 01:28 AM
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The tool is on its way, i will let you guys know what i am at when it gets here. The pinion angle is all thats left. At 70 im getting a choppy vibration that just gets worse and worse.

So if it was tires it would be constant, shaft is balances, ujoints are new, if it was a diff problem it would be constant...i have just kinda checked everything off 1 by 1.

Dustin
Old 04-15-2009 | 01:39 PM
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it could be tires easily. i just got some new ones that weren't balanced and it would start to shake at 70 and up, got them balanced and now 120 and no shaking.
same thing with my friends tires a couple days ago...
Old 04-15-2009 | 02:37 PM
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Balanced them on 3 different occasoins (can do it at work anytime i need to), have 2 more coming in on monday if it goes away, that is what it was, if it dont, Pinion angle.

Dustin
Old 04-15-2009 | 02:41 PM
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the thing is if it was the pinion angle it would have done it as soon as you put the shackles on and it would do it every time. did this start right after the shackles?
Old 04-15-2009 | 08:55 PM
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Originally Posted by dlt76028
the thing is if it was the pinion angle it would have done it as soon as you put the shackles on and it would do it every time. did this start right after the shackles?
Here is my thinking, when i first did the shackles i had 3.23's, and i had a similar vibration, but it was at like 100ish (i think), i hardly drove that fast so i never noticed it. Now with the 4.11's the rpm is changed, the torque multiplication is changed, so now i notice it at 70so that is why im thinking pinion.

Dustin
Old 04-16-2009 | 04:31 PM
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Not to hijack but i am having the same problem at 40 the bed shakes like a sob.Just bought new wheels and had them balanced twice.I amlowered 5/8 with western chassis stuff so what would my pinon angle need to be on a 07 nnbs rcsb?
2005 silverado.I hope you get it fixed cause it is annoying.



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