Converted the front drive shaft from CV to U... vibration... - JeepForum.com

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post #1 of 49 Old 04-21-2013, 02:07 PM Thread Starter
Tigersan
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Converted the front drive shaft from CV to U... vibration...

I did a conversion from CV join to U joint on my front drive shaft.
I ordered it from carolina driveline. My car vibrates between 60-80MPH
Guys from the c driveline say the crush sleeve has to be replaced when
you replace the yoke. When the mechanic shop did the replacement
they didnt even ask me if i want the crush sleeve to be replaced,
as an option. And carolina driveline guys say it HAS to be.

My question is... does it have to be replaced when you replace the yoke?
and is it possible that vibration is caused by this or carolina driveline guys
are just playing ping-pong with me, blaming the mechanic shop? Could it
be badly balanced shaft?


1998 ZJ 5.9 Limited Platinum 100xxx miles...
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post #2 of 49 Old 04-21-2013, 02:09 PM
dnuccio
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i bet the shop just marked the nut and put it back on that way. when you swap the yoke, you need to set the pinion preload. i wouldnt be surprised if the pinion was loose. you dont always have to replace the crush sleeve

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post #3 of 49 Old 04-21-2013, 02:20 PM
kg6mov
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I believe rat preaches replacing the crush sleeve and I would tend to go with what he says. Carolina does pretty good work so I would doubt the shaft itself is out of balance. Where did the donor pinion yoke come from? Could it have been damaged in its last life and it wasn't noticed when installed?

1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ 5.9 - Junked
1984 F250, 460 BB, T19, work truck/future tow pig
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I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #4 of 49 Old 04-21-2013, 02:29 PM Thread Starter
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I think they used old pinion. From what they told me they didnt touch the pinion they just put the new yoke on it...
The yoke came with the shaft from carolina driveline. It was a whole conversion set with the new yoke.

So it looks like the mechanic ****ed me over right? How do i talk to him when I get back? What do I say to him, so that
he cant turn it around or deny it... He ****ed up the job now my car vibrates, and didnt even ask me if i want the crush
sleeve to be replaced...

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post #5 of 49 Old 04-21-2013, 05:53 PM
dusterdude
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There is a yoke adapter for the rezeppa shaft to a ujoint shaft,did carolina send that with the shaft or by chance did the shop get one?
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post #6 of 49 Old 04-21-2013, 06:01 PM
kg6mov
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Carolina sells two kinds of cv to u shafts. A real U shaft that requires swapping the pinion yoke and a u shaft with a cv plate on it that bolts up. They don't guarantee no vibes on the cv plate adapter style but they do on the real u joint.

Hop under the jeep and see if there is any play in the pinion bearing to indicate it's shot. If it is they didn't install it correctly.

1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ 5.9 - Junked
1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

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I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #7 of 49 Old 04-21-2013, 06:22 PM Thread Starter
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They sent me a shaft that has dual U joint on the T-Case side. And single U joint on the axle side end. It came with yoke installed on the driveshaft.

I was converting from doubleU and CV to doubleU and singleU.

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post #8 of 49 Old 04-21-2013, 08:16 PM
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The whole point of a CV joint is that it does not vibrate as much as a u-joint. Sounds like a classic case of fixing something that is not broke . . .
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post #9 of 49 Old 04-21-2013, 08:20 PM Thread Starter
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Before this jeep I had a 96 ZJ with 4.0 engine and it had u joints everywhere, even in front wheels. It didnt vibrate... So unless the u joint is worn it shouldnt.
Besides all models always had u joint in rear drive shafts and ALL cars do. My car isnt lifted so the pinion angle is perfectly in line with the shaft.
So as long as the shaft is balanced properly and the joints are new like in my case. They shouldnt vibrate. I'm just trying to eliminate possibilities so I dont throw
away money by replacing things that didnt need to be replaced. My CV joint pooped its *** when my rear wheels slipped on wet asphalt when awd engaged.
So it seems ridiculous to me to put a cv joint on a driveshaft. When u joint is straight almost at all times it wont vibrate or cause inconsistent velocities, but
its ALOT more durable than CV - which i learned hard way pressing the gas pedal a little too hard on wet asphalt. Thats why i replaced it to u joint because
i trust it more based on my experience with previous ZJ which was fine at 150000 miles, while CV joint pooped badly at 84000 in my niner not even offroading
or anything...

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post #10 of 49 Old 04-21-2013, 09:27 PM
dnuccio
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i agree with you. my cv **** the bed in my garage when i was pulling up onto car ramps to change the oil. im glad it didnt do it while i was out wheeling somewhere. have all the parts gathered for the u joint swap, just need to borrow a torque wrench.

Reliability is relative
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post #11 of 49 Old 04-22-2013, 05:06 AM
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It doesn't have to be replaced. But the preload absolutely needs set.
Most shops just torque it down to the minimum for the axle and call it a day. That's the method for a shimmed axle, not crush sleeve.


Try flipping the shaft vs each yoke, sometimes they can be a little out of round and doing that helps.

I'd also double check pinion angles instead of assuming it's good because you haven't touched it.

'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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post #12 of 49 Old 04-22-2013, 11:35 AM Thread Starter
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I checked theres absolutely no play on the pinion, it looks and sits solid.
Spoke to the mechanic again, i trust this guy he knows what hes saying.
And he said hes been doing this for years... im at a loss...

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post #13 of 49 Old 04-22-2013, 11:52 AM
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My 95 with a 249 had minor vibe in the front at certain highways speeds. My 5.9 does too with a u joint shaft. How is your VC? I think the 249 has some inherent vibe.
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post #14 of 49 Old 04-22-2013, 01:54 PM Thread Starter
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Well before the CVjoint pooped there was no vibration atall. It was smooth
like gliding up to 90mph (didnt go any faster) no vibration whatsoever.
It started vibrating after i put the new shaft in. So i doubt its a T-case.
I mean logically it will be something that was messed with during the shaft
replacement process. Or the shaft itself.

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post #15 of 49 Old 04-22-2013, 02:05 PM
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Quote:
Originally Posted by Tigersan View Post
Well before the CVjoint pooped there was no vibration atall. It was smooth
like gliding up to 90mph (didnt go any faster) no vibration whatsoever.
It started vibrating after i put the new shaft in. So i doubt its a T-case.
I mean logically it will be something that was messed with during the shaft
replacement process. Or the shaft itself.
Well what I was trying to allude to was the fact that my 95 had a U jointed drive shaft from the factory and it had oscillations/ small vibes at certain highway speeds. My 5.9 did not have vibes with the CV shaft but when I replaced it with a u jointed shaft it now behaves like my 95 did. The reason they started putting the CV shafts in with the 249 is because they are smoother but as I found out, they rip apart flexing off road.
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