Vibes in the rear - Defender Source
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  #1  
Old May 29th, 2016, 11:55 AM
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Vibes in the rear

Have been chasing a vibration for a while in a 97NAS SW and IVE performed all the usual checks and made the typical corrections, such as uj and balanced drive shaft.

Is it possible that I have a slightly bent/twisted rear axle shaft? The reason I ask is I'm also blowing through inner axle seals. I'm on my second one in less than 6k miles. The breather hose is clean so I don't think it is from air pressure.

I'm wondering if by chance my shaft is slightly bent it is causing the vibes that increase with speed under load and fouling my inner seal?

Without my rear drive shaft in however I don't feel the vibe but my inner seal has failed.

Thanks in advance.
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  #2  
Old May 29th, 2016, 12:25 PM
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Charles Galpin
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I can lend you another rear shaft(s) to try. If you still have the vibe then I'd suspect the diff. Shafts are easy to try though.
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Old May 29th, 2016, 12:49 PM
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Quote:
Originally Posted by cgalpin View Post
I can lend you another rear shaft(s) to try. If you still have the vibe then I'd suspect the diff. Shafts are easy to try though.
I'll take you upon that.
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Old May 29th, 2016, 11:00 PM
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Clay, how is the shoulder of the axle stubby? if defective it will go thru seals. of course if bad then you have two choices, sleve the shoulder or renew the stubby.
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Old May 29th, 2016, 11:05 PM
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Pull the rear axles and inspect/swap.



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  #6  
Old May 30th, 2016, 12:03 AM
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Quote:
Originally Posted by carlosz View Post
Clay, how is the shoulder of the axle stubby? if defective it will go thru seals. of course if bad then you have two choices, sleve the shoulder or renew the stubby.
I'm not sure. I'll have to take a closer look.
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Old May 30th, 2016, 01:50 AM
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I have been fighting vibrations on my '95 for some time. Had the driveshafts at two different shops for balance and inspection. Roadsiderob at SWR Automotive checked them out and found the front was assembled incorrectly (supposed to be 45 degrees out of phase) and the rear was a POS. Front used solved some of the problems but a new rear from AB for $200 fixed the back. Wish I had replaced the rear a long time ago. Good luck.
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Old May 30th, 2016, 02:27 AM
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When I had GBR install my Detroit in the rear, Bill suggested I scribe a line down it to keep track of twisting. When the left rear axle started to leak is when I discovered that the long axle (left rear) had a 3/4 twist in it (probably from Moab ). Maybe that was why the inner seal failed, who knows. I replaced the long axle (scribed for free ) & replaced the seals on both sides.

Scribing a line down the long axle is a useful idea with no cost involved, Thanks Bill !!
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  #9  
Old May 30th, 2016, 09:59 AM
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Smart move on the scribe. I was advised as well and procrastinated like an idiot. If mine has a twist I'm sure this was the trail that did it in. Quorum @ the Cove. Fun trail, especially trying to keep pace with Galpin, but it has an exit fee.

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Old June 15th, 2016, 12:02 PM
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I was thinking about this the other day Clay when some of us were talking about axles,

Pull the shafts out, and roll the shaft part on a good flat table and see what you see (clean them first if you use the kitchen table/counter!)



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Old June 15th, 2016, 12:15 PM
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Quote:
Originally Posted by Nomar View Post
I was thinking about this the other day Clay when some of us were talking about axles, Pull the shafts out, and roll the shaft part on a good flat table and see what you see (clean them first if you use the kitchen table/counter!) .
Nice! Yeah, gear oil stained butcher block would quickly get under the wife's skin.

Hey Charles, do you happen to still have the pics of that paint test you did to the diff by chance?
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Old June 15th, 2016, 10:14 PM
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You will have to refresh my memory. Paint test?
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Old June 15th, 2016, 11:14 PM
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This thread title always makes me chuckle.
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  #14  
Old June 16th, 2016, 08:09 AM
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Quote:
Originally Posted by cgalpin View Post
You will have to refresh my memory. Paint test?
You borrowed my diff as a comparison for gear-mesh patterns and took a couple pics once.
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Old June 16th, 2016, 08:18 AM
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Quote:
Originally Posted by 1of40 View Post
Have been chasing a vibration for a while in a 97NAS SW and IVE performed all the usual checks and made the typical corrections, such as uj and balanced drive shaft.
Did you check rear wheel bearing torque ?
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  #16  
Old June 16th, 2016, 08:40 AM
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Quote:
Originally Posted by nathanwind View Post
Did you check rear wheel bearing torque ?
ha! good call and always worth a 2nd or 3rd check but last year I replaced the bearings and seals and assuming it was locked down properly. Truth is it was done by feel and not with a torque wrench.
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