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  #1  
Old August 26th, 2017, 10:34
Desert4x4 Desert4x4 is offline
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Front driveshaft spins in 2wd with unlocked hubs

So I installed the Yukon locking hub conversion. Now when I go over 65mph the front drive shaft spins causing unwanted vibration. I have verified that the drive shaft is spinning with undercar videos. It will do it even if I run the rear wheels in the air and vehicle stopped (front wheels stopped). Anyone know if this is normal ?

Last edited by Desert4x4; August 26th, 2017 at 10:44.
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  #2  
Old August 26th, 2017, 11:43
RCP Phx RCP Phx is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

What year and transfer case?
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  #3  
Old August 26th, 2017, 11:46
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by RCP Phx View Post
What year and transfer case?
1999 NP242
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  #4  
Old August 26th, 2017, 12:05
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

It's just annoying because I installed the $1200 kit so I wouldn't have anymore front driveline vibrations.
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  #5  
Old August 26th, 2017, 13:49
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Front driveshaft spins in 2wd with unlocked hubs

I bet one of the hubs is installed incorrectly or your jeep hates you


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  #6  
Old August 26th, 2017, 13:55
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by themauler View Post
I bet one of the hubs is installed incorrectly or your jeep hates you


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I don't understand, if the front wheels are stopped how could one of the hubs cause it? I'm testing this when the rear wheels are jacked up and I run them to 65mph. I'm sure I could lock the hubs and then try the same test with the rear tires in the air and the driveshaft will NOT spin. I'm just trying to figure out why there is so much drag causing the front shaft to spin when in 2wd. Perhaps the center diff in the NP242 is not designed to alow the front shaft to be stopped.
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Old August 26th, 2017, 14:10
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Re: Front driveshaft spins in 2wd with unlocked hubs

I'd bet it's simply enough in the t-case to cause it.

Just because it isn't being powered doesn't mean there isn't still enough friction for it to turn. Just like an open diff, if both tires are in the air, both will turn, even tho you can easily stop 1 side with your foot. And the 242 case I believe has a diff in it just like your axle to let you drive in 4wd all the time.

Can you stop it from turning with something easily ?? if you can, then if you lock your front hubs in, I'd bet the front shaft stops turning. (if you try this, be ready in case it comes off the jack stands - We don't know right now for sure what is wrong)


and I would NOT recommend running it up to 65 on jackstands...if it comes off in the least, you're gonna get very hurt
.

Last edited by TRCM; August 26th, 2017 at 14:19.
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  #8  
Old August 26th, 2017, 14:12
RCP Phx RCP Phx is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

You got to remember that the 242 is a "part-time" case.
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  #9  
Old August 26th, 2017, 14:22
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Re: Front driveshaft spins in 2wd with unlocked hubs

Does the front DS spin freely when not running?

I wouldn't be surprised that it would start spinning simply from the slight bearing drag of the TC.
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  #10  
Old August 26th, 2017, 14:37
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

It does spin freely. It won't keep spinning if I spin it by hand though. Hmm. I just don't like having to keep it under 65 to keep the vibes from happening.
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  #11  
Old August 26th, 2017, 14:38
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

I used tie wraps to hold the shaft but the shaft ripped them off when I revved the jeep up to 80.
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  #12  
Old August 26th, 2017, 15:32
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

A few days ago I was hoping that I could just use different fluid to make the front driveshaft less prone to freewheeling. I switch from Mobil 1 ATF to Mobil 1 5W-30, and neither fixed the issue.
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  #13  
Old August 26th, 2017, 15:37
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Re: Front driveshaft spins in 2wd with unlocked hubs

sounds like your pinion angle must be extreme
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Old August 26th, 2017, 16:15
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by Boostwerks.com View Post
sounds like your pinion angle must be extreme
It is, but... I had angled it to perfectly straight, and the vibration was still there. The driveshaft was also rebuilt, balanced and trued, and the vibration was still there. I also replaced the transfer case, no change.
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  #15  
Old August 26th, 2017, 16:16
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by RCP Phx View Post
You got to remember that the 242 is a "part-time" case.
Yes I know. But I'm not using 4x4 on the street.
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