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Old 03-07-2013, 03:04 PM   #1
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vibration above 40mph

For starters, last week I changed my rear U joints b/c I swapped one d35 w/3:07 for another D35 w/ 4:10. My U joints werent really bad, I just changed them because I had the shaft out.

Now I have a vibration above 40 MPH but only when I'm off the gas/decelerating, accelerating and maintaing speed there is no vibe.

Today I checked the shaft out and shook it all over and there was no play in its movement. Pretty positive its coming from the rear, right now my front shaft is removed.

I'm pretty sure my angles are pretty decent...Anyone have any thoughts?

the angles look a little worse in the pics than they actually are bc i was holding the camera low.

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Old 03-07-2013, 03:25 PM   #2
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Not to overstate the obvious, but, since the vibration started with the "new" differential, I would take a look at the pinon and carrier bearings.

Also, did you index the front yoke/driveshaft before you took it apart ???

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Old 03-07-2013, 03:32 PM   #3
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I had the new rear apart to inspect it and change fluid/fix brakes, didnt take too much time with it as its temporary

and in hindsight i realy should have marked the front shaft's position

the old u joints did not have zerks in them, the new ones did, if the zerks arent aligned would that be enough to throw it off?
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Old 03-07-2013, 07:17 PM   #4
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Double check the angles - actually measure them - that is the only way to verify if they are OK. Considering you swapped rear ends, the angles may be slightly different.

Not sure if marking the front shaft position would matter. I snapped my slip yoke one time and installed a new one without problems - unless I just got lucky. No reference to work with because the pinion yoke spun on it's own after the yoke snapped off the t-case. Just reinstalled the driveshaft, new slip yoke and new u-joints. I think I put the zerk fittings opposite each other, but not sure if that matters.

If the rear end was not rebuilt, it could have some inherent problem with it.
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Old 03-07-2013, 07:28 PM   #5
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I got to thinking about the front and it wouldnt have mattered as I have a new 4:10 d30 to swap out there, so the alignment wouldnt be there anyways.

I will measure the angles, didnt think about this til you said double check it but the "new" rear had a shorter yoke on it than the old one so I swapped them to keep as much shaft as possible in the TC, so its possible these two axles have different spring perche angles.
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