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Old 07-05-2017, 03:02 PM
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YJ's front drive shaft is always spinning.

2 weeks ago I got an Eaton E locker with 4.88 gears put in my front end. I also have a Yukon locker and 4.88 in the rear. The front axle vacuum line was removed and a metal plate was used to cover the opening. When in 2WD my front DS is always spinning. I was feeling vibrations so right now my DS is at a shop getting looked at. Now that I have it off, the yoke on the TC spins freely as it should in 2HI. So my question is, should my front drive shaft be spinning all the time due the the vacuum being removed? Also does this mean my jeep is technically always in 4WD? Lastly is there anything I can do to fix this? Thanks for your help.

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Old 07-05-2017, 03:19 PM   #2
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Sounds like they did a tj front axel swap. If that's the case yes...you say a CAD delete was preformed, how do you lock the 2 passenger side axels together now?

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Old 07-05-2017, 05:16 PM
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It's The same D30 but the shop deleted the CAD when I upgraded to chromoly 30 splines and E locker. Over the CAD it's just a metal plate.
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Old 07-05-2017, 07:06 PM   #4
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If they did a cad delet then your front driveshaft will always spin.
The front driveshaft is not balanced from the factory so that is why you have vibes. You will have to get your driveshaft balanced or a new driveshaft.
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Old 07-05-2017, 07:09 PM
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Okay thanks. It's at the shop right now getting spun so they can see the vibs. I just wanted to confirm that was my problem
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Old 07-05-2017, 07:11 PM   #6
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CAD is a central axel disconnect...a vacuum actuator moves a fork that moves a collar over and your 2 piece axel and it turns into one..a stock yj actually has 3 front axels....if you delete the cad motor then your passenger side axel would never get any power to it...if the cad was deleted they had to installed a TJ dana 30 one piece shaft on the passengers side or a cable type device to lock the pass axel together ..TJ front DS turn all the time too...it's turning because the wheels are turning your TC is still in 2wd...once you balance your DS you should be fine..
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Old 07-05-2017, 07:31 PM   #7
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Yes, driveshaft should always be spinning. If you still have the CAD and an open diff, it may not spin but it will sort of "float". The transfer case disconnects the front end, so the wheels turn the gears which turn the driveshaft.
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Old 07-05-2017, 08:20 PM
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Okay so this isnt uncommon for YJs then when they get lockers. Do people generally keep this set up or for example, do they buy the "no spin kit" from yukon? I dont have a problem with the DS spininig all the time as long as its actually in 2WD, but Im wondering what the better option is with regards to DS and axle longevity.
Thanks.
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Old 07-05-2017, 08:23 PM   #9
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If you're REALLY concerned, get lockout hubs. It honestly doesn't really matter. It's probably better to keep everything moving anyways.
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Old 07-05-2017, 08:58 PM   #10
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You're not getting it. The ds is spinning now because your ring gear is turning your pinion gear all the time. Not due to your locker, but due to the cad removal. You are not in 4 wheel drive until you put your tc in 4 wheel drive. Your axals are spinning your diff, diff is spinning your drive shaft, that is spinning the output shaft of your tc. Output shaft is just spinning till it is shifted into 4wd when it is now linked to the rear output via the chain. Removing your cad and installing a tj shaft is a bit stronger, but it's also a slight a trade off in MPG and a few more parts spinning all the time.
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Old 07-06-2017, 08:45 AM   #11
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Basically without (just like all stock TJ) whenever the front wheels spin the driveshaft has to spin too but in 2HI the front driveshaft is not connected to the tranny output spin so you are really still in 2wd

Unless you have working cad or add manual hubs your front driveshaft spins when ever your jeep is moving


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Old 07-06-2017, 11:21 AM   #12
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If it's just the difference between being in 2WD or 4WD you are worried about, if you are in 4WD on pavement, you will know it!
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Old 07-06-2017, 12:05 PM   #13
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Once the driveshaft is properly balance the vibration should be gone. If the driveshaft shops best efforts doesn't get rid of the vibration to your satisfaction, you may consider this.....not a "perfect" solution, but never the less, a solution.

You can remove the front driveshaft for daily driver duty and keep it in the back of the Jeep along with some tools or store it in your garage. When you head out to the trails, you can reinstall it and suffer whatever vibrations it produces while driving on the highway.
How much DD duty your Jeep does may determine the practicality of this suggestion.

You can confirm the accuracy of the other posters posts by jacking up the front of your Jeep and supporting it on jackstands. Assuming your front driveshaft is still in the shop, have an assistant turn one front wheel and then the other while you try to hold the pinion flange immobile. You won't be able to do so because the assistant will have more leverage due to the diameter of the tires. This will confirm the post by Ov yj.

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Old 07-06-2017, 08:00 PM   #14
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There are a lot of things what will mess up your driveshaft balance. If you have lift shackles that will mess with it, if you have a drop transfer case that will mess with it. The factory driveshaft was not balanced because it was not designed to spin all of the time. On jeeps with no axles disconnect they ran balanced CV driveshafts to keep it from vibrating.

I just went though this same problem you will need to measure your drive-line angles. My jeep had 1" lift shackles that pushed the pinion up about 7-8* it's supposed to be at about 5-6* so i bought STEEL 2* shims and shimmed the front axle back to where it should be. And with my lift i got lucky and the front axle yoke pointed directly at my transfer-case yoke, right where it needed to be to run properly. Even then i had a slight vibration so i had to have a driveshaft that was triple balanced with weights on both ends of the shaft. You are going to need a CV shaft i recommend Tom Woods with the heavy duty spline they are 100% worth the money. Maybe i just got unlucky with the balancing but if i were to do it again i would ask them to triple balance it, mine is smooth as butter now.


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Old 07-09-2017, 12:19 PM   #15
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Quote:
Originally Posted by Ov yj View Post
You're not getting it. The ds is spinning now because your ring gear is turning your pinion gear all the time. Not due to your locker, but due to the cad removal. You are not in 4 wheel drive until you put your tc in 4 wheel drive. Your axals are spinning your diff, diff is spinning your drive shaft, that is spinning the output shaft of your tc. Output shaft is just spinning till it is shifted into 4wd when it is now linked to the rear output via the chain. Removing your cad and installing a tj shaft is a bit stronger, but it's also a slight a trade off in MPG and a few more parts spinning all the time.
^^ What he said...

That being said, I have the 1-piece shafts in my 95, plus an Aussie and I have zero vibes after fixing the loose pinion bearing preload. My OEM shaft was pretty worn out at the splines, so I had Adam's Driveshaft send me a pretty new one The front is smooth as silk...

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