Bad Vibration after Front Driveshaft Install

[WILDHOBO]

But that Adam's sticker is REALLY COOL!! Lol ? Oh, then there was also the free t-shirt!!

I do dig stickers. I keep saying the driveshaft is going to be a new sticker placement location. But I never seem to do it.

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[WILDHOBO]

With the driveshaft price, the t shirt cost was likely covered.

In all seriousness, what spring seats did you get? My rear is around 6” now. Very little bow, but some.

 

[ShadowsPapa]

Im betting OP has something else going on . Maybe a joint out of phase ?

How can a single joint be out of phase?

Mine is about 4.4 degrees caster, pinion 0.
So if I added 1 degree caster, I'd put the pinion down a degree. On a stock height truck, no big deal at all.

Do you drive over 25 or 30 with the transfer case in 4H?

 

[WILDHOBO]

Hoping for the best of luck and all things work out.

That's the other thing about a lift above a certain height, and tilting the rear axle housing to achieve a straight line on that rear joint - spring bow. Sounds like you have it planned and under control so far.

It would be nice to see a spring angle correction/spacer in one part.

 

[Gizmo]

How can a single joint be out of phase?

Mine is about 4.4 degrees caster, pinion 0.
So if I added 1 degree caster, I'd put the pinion down a degree. On a stock height truck, no big deal at all.

Do you drive over 25 or 30 with the transfer case in 4H?


Just offering what I have seen , done ,heard or had for years . I'm not asking for anyones approval. I do remember some drive shafts have a slip joint are they all keyed I don't not know to say so. I merely offered the out of phase as something DIFFERENT to think about VS telling people how it HAS to be a DC on each end, My God

 

[JeepOfTheseus]

With the driveshaft price, the t shirt cost was likely covered.

In all seriousness, what spring seats did you get? My rear is around 6” now. Very little bow, but some.

They are from Rock Krawler:

RKKRK07430 - Driver
RKKRK07431 - Passenger

Passenger is just .5” thicker, but otherwise interchangeable. I had to do a PO through @Northridge4x4 as one of them wasn’t listed.

 

[ShadowsPapa]

For anyone lurking, wanting to learn - you can check the videos posted earlier in this thread where they address the need for proper phasing - lining the joints and yokes up perfectly in a straight line, and ->
Out of phase only applies in cases of two single cardan joints.
So in the case of our Gladiators, it's not a problem because there's no mate to it.

Phasing with two single joints is necessary, there's nothing to phase if there's only one single joint.

With a double joint at one end - those two cancel each other out, then there's a single joint at the other end, it doesn't matter how it lines up with the double joint as they don't impact each other in rotational speed changes.

For this driveshaft pictured, there are two single cardan joints. Note the orientation of each joint. This shaft has arrows stamped onto it to show how things should line up.
This one is perfectly lined up, phased correctly. It matters only because there's a single joint at each end.

 

[ShadowsPapa]

I merely offered the out of phase as something DIFFERENT to think about VS telling people how it HAS to be a DC on each end, My God

No one said it has to be a double on each end - only that running a single at a severe enough angle MAY cause vibrations, and we're seeing just in this thread, what, 3 people who have or have experienced that issue?
If you can't or won't run two double joints, or a CV, then you may have to shift the pinion to get rid of vibration. Some joints will be worse than others. Also check the joint to see it's not too tight. It should turn freely in all directions and not be hard to move or turn.

 

[Gizmo]

Just trying to help ....are ya done now ?

 

[ShadowsPapa]

Just trying to help ....are ya done now ?

Yeah, apologies, took your post wrong.
you did bring up a point

(and yesterday the doc said he's cutting back on the gabropentin or whatever the heck it's called)

 

[Gizmo]

 

[Wheelin98TJ]

So you are saying all of the videos, all of the math and science is wrong.
That anyone can indeed run a single joint at more than a few degrees and it won't vibrate.

What was the angle on your TJ's pinion end joint?
How much caster did you run and what was the angle of that joint,
and was it a single joint at both ends or a double at the transfer case and a single up front?
If your pinion angle was low and there was little angle to the joint, then you got by.

If it was a single joint at both ends - that matters, because one can cancel out the other.
So we need to go tell all of those people, including spicer, their videos are crap and dead wrong, it won't matter, you won't have vibration.

And yet in this very thread, two are having vibrations - since using these shafts.

Eventually I was running double cardan at the t-case for both driveshafts. Like many other lifted Jeeps. Started off with stock driveshafts. Did a motor swap at one point and needed different length driveshafts, so replaced both front and rear.

I can’t remember exact caster, but probably 5-6 degree range. It drove great. I put over 200k miles on that Jeep. I changed one rear u-joint when it still had the original driveshaft and slip yoke on the t-case.

 

[ShadowsPapa]

Eventually I was running double cardan at the t-case for both driveshafts. Like many other lifted Jeeps.

The transfer case output to driveshaft up front is a pretty steep angle. I can't imagine running anything else, unless it's a true CV but then you get into in the rocks maintenance.
I've done more digging and it would seem that you could be ok on the pinion end joint up front up to about 10 degrees, then the oscillations start climbing exponentially.

Away from all the other stuff - love hearing about the miles people get on some of the older models. 200K, that's a lot of fun.

 

[Lunentucker]

I see a good bit of half-hearted joking on Adam's in this thread, but I go back to what I said earlier. A company can only control who does what with their products to a certain point, and I think a good number of these things end up in places they shouldn't be, and installed by people who don't fully understand what they're doing.

You can't really blame Spalding for making a "football" that's hard to throw and get a good spiral for distance and accuracy.

 

[ShadowsPapa]

I see a good bit of half-hearted joking on Adam's in this thread, but I go back to what I said earlier. A company can only control who does what with their products to a certain point, and I think a good number of these things end up in places they shouldn't be, and installed by people who don't fully understand what they're doing.

You can't really blame Spalding for making a "football" that's hard to throw and get a good spiral for distance and accuracy.

Great, now the Brits and Aussies are going to be after you.

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