Driveline Knock of Death - Defender Source
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  #1  
Old December 4th, 2007, 09:49 AM
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Driveline Knock of Death

Guys,
I think my '94 has developed the driveline knock of death. I have a really annoying clunking in 1st and 2nd gear when accellerating and decelerating. I know the D-90s are prone to this and some of it is normal, but mine just not feel right. I have checked my u-joints and a-frame ball joint and all are tight. Is my last option the tailshaft on the tranny? I read about it here: http://www.landroverclub.net/Club/HT...r_problems.htm

I have rebuilt older Jeep trannies and transfer cases, is the R380 difficult to rebuild? If the tailshaft is the culprit, can I remove the t-case and replace the tailshaft with the tranny still in the vehicle? Are the parts expensive. Anyone have any ideas or done this before?? Is there anything else that might cause the noise?

Thanks!!
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  #2  
Old December 4th, 2007, 11:48 AM
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Scott T
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Before you start pulling components out for rebuild, pull the PTO inspection plate off the back of the transfer case, and have a look in there with a flashlight. You will be staring at the backside of the Transfer case's input gear, with the end of the transmission output shaft visible in the middle. Check for excessive play between the two, and for visible spline wear. The input gear can be easily removed as well by removing the bearing endcap bolts and pulling it straight out to get a better look if need be.

Unfortunately it is quite common for excessive wear to occur here, and requires the transmission to be removed from the vehicle and completely rebuilt to replace the output shaft. Several of the guys (Evilfig - Ron is one that comes to mind) are familiar with and have rebuilt these several times, and will hopefully chime in soon with more information.

Rob Dassler is also a board member with a great reputation for his rebuilds, and a wealth of knowledge, if you need to go this route. If I recall the parts are not too terribly expensive, but make sure you get one of the newer cross drilled input gears if you do. The Gear has longer splines to engage more surface area on the transmission's output shaft splines, and is cross drilled to get more oil to the splines.

Here are a couple of photos posted in the past that show the spline wear issue and updated cross drilled input gear. The output shaft in the photo is on an LT77 and look slightly different than the R380's, in that it has the threaded portion on the end. The Input gear photo also shows the automatic transmission's output shaft adapters next to the gear. Hope that is of some help..
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  #3  
Old December 4th, 2007, 07:29 PM
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Charles Galpin
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First, make sure Dave hasn't been under there licking anything he can reach.

But then I'd remove the rear driveshaft and lock the center diff and make sure the vibe is gone. Repeat with the front if necessary. How sure are you it's not the u-joints?

charles
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  #4  
Old December 4th, 2007, 09:14 PM
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It's not a vibration, it's a knocking.
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  #5  
Old December 5th, 2007, 08:48 AM
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LOL. Hey JR, didya check all the obvious stuff like bushings and motor/trans mounts? U joints?

Quote:
Originally Posted by cgalpin
First, make sure Dave hasn't been under there licking anything he can reach.

But then I'd remove the rear driveshaft and lock the center diff and make sure the vibe is gone. Repeat with the front if necessary. How sure are you it's not the u-joints?

charles
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  #6  
Old December 5th, 2007, 09:08 AM
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I think Dave's going in the right direction -- radius arms and panhard rod bushings would be the first thing I'd check.
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Old December 5th, 2007, 09:36 AM
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You can also have a knock where the rear a-frame mounts to the axle at the ball joint. Of course my wife's transfer case also just blew up too.
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  #8  
Old December 5th, 2007, 09:40 AM
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I checked the rear a-frame joints and the ball joint. All are tight. My final test this weekend will be to disconnect each driveshaft to see if I can pinpoint it. I will also remove the PTO cover on the t-case, so I'll keep you posted.
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  #9  
Old December 5th, 2007, 11:00 PM
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Sabotage from the previous owner. Maybe the photo shoot got a little carried away.

JP
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