drivline angle, should it vibrate that bad? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-05-2004, 12:07 PM Thread Starter
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drivline angle, should it vibrate that bad?

Here is a pic of what i have setup. It vibrates very very badly. Im not sure if its the angle or just the fact that the new 8.8 is offcenter 1-1/2" but its one vibrating mofo. The vibration comes mostly under load be it speeding up or slowing down. There is almost even a shimmy during takeoff like the jeep hops a bit untill you get up over about 5 mph.

I guess the next step is sye but i didnt think it would vibrate that bad setup this way. [img]images/graemlins/frown.gif[/img]

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post #2 of (permalink) Old 02-05-2004, 12:12 PM
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Re: drivline angle, should it vibrate that bad?

1. It's really a compound angle,
2. Both vertically and horizontally,
3. So, in truth,
4. It's always at a compound angle,
5. During it's 360* rotation.
6. To eliminate vibrations,
7. It has to be within 3* during
8. ALL of the 360* rotation.
9. How about using a cardin jointed driveshaft?
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post #3 of (permalink) Old 02-05-2004, 12:20 PM
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Re: drivline angle, should it vibrate that bad?

From that pic, it looks like the pinion on the axle and the drive shaft are in a nice line. But there is a big difference in angle between the Tcase, and the Drive shaft. That is the correct set up for a CJ drive shaft. But you don't have a CJ drive shaft.
2 possible solutions are
1) go with a SYE and a CJ drive shaft. that will probably work well for you. or if you want to stay with the driveshaft you have.
2) cut off your axle spring perches and rotate the axle so that the angle of the pinion in Ref to the ground, is the same as the angle of the Tcase in ref to the ground.
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post #4 of (permalink) Old 02-05-2004, 12:52 PM
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Re: drivline angle, should it vibrate that bad?

Yeah, from that pic it looks like your axle (pinion) is pointed up too high.

Now, IF you are running a CV driveshaft, you want the pinon and the driveshaft in a nice straight line - i.e., no angle - when it is on the ground.

But, for a regular slip yoke design, and a 1 piece shaft like you have, you will need to find a way to point the pinion down some. If you had adjustable trailing arms on your suspension you could do this. Are there any adjustmenets in your arms?

Pete
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post #5 of (permalink) Old 02-05-2004, 02:44 PM
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Re: drivline angle, should it vibrate that bad?

Get one of these:



Then compare your angles to this.
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post #6 of (permalink) Old 02-05-2004, 02:48 PM
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Re: drivline angle, should it vibrate that bad?

</font><blockquote><font class="small">In reply to:</font><hr />
1. It's really a compound angle,

[/ QUOTE ]

It is not a compound angle. The two joints are just not operating through the same angle.
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post #7 of (permalink) Old 02-05-2004, 03:14 PM Thread Starter
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Re: drivline angle, should it vibrate that bad?

Great info guys. When i set the thing up i preset the angle of the pinion for the up and comming sye, i just never looked at how it would affect the stock setup. Well now I know. I wonder how long the ujoints will last like this. I am going to order the sye today or tomorrow i think and maybe have it done in a few weeks. I hope everything holds up untill then.
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post #8 of (permalink) Old 02-05-2004, 06:25 PM
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Re: drivline angle, should it vibrate that bad?

</font><blockquote><font class="small">In reply to:</font><hr />
I wonder how long the ujoints will last like this.

[/ QUOTE ]

U-joints are cheap, I'd be worried more about the pinion bearings and transfer case output bearing.
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post #9 of (permalink) Old 02-05-2004, 07:38 PM Thread Starter
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Re: drivline angle, should it vibrate that bad?

Good point. Im going to be taking it out this weekend for a small trip and I think its going to sit after that. I should have the sye by next wednesday and sounds to me like a new project by next weekend. I think the bearings in my t-case are already shot. I hear some funky noises coming from it and it sounds like bearings rolling in a pile of mud. I'll get to see once i get it apart.
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post #10 of (permalink) Old 02-10-2004, 10:36 PM Thread Starter
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Re: drivline angle, should it vibrate that bad?

Well, T-case is out and in the back of the honda ready to take to work tomorrow for the sye install. Anyone care to let me know if there is anything I should take into concideration in advance? I hope it goes smoothly and the jeep is back on the road by friday. Nice driveline showed up from tom woods today. I hope its long enough.
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