Gremlin in front differential. - Defender Source
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  #1  
Old September 5th, 2014, 09:12 AM
Johankos
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Gremlin in front differential.

First of all, thank you for this excellent forum. I don't contribute much since I'm still in the "learning phase".

New to me 1971 88 Series IIA. Love it and my 2004 RR has been parked ever since I got this. I have one issue: When rolling down a hill out of gear or when coming to a rolling stop there is a noise coming from transmission tunnel/front differential. Best described as banging on metal with a ball pin hammer. Noise is rhythmic and follows speed of wheel rotation. I unlocked my Warn hubs and did a road test and when hubs are in "Free" the noise is gone. Jacked up truck and tried to duplicate noise but all I get is a slight tick from differential area with each wheel revolution. Not at all like the banging I hear when rolling. Also, the noise is not present when truck is under power, well at least I can't hear it.

Thank you everybody,
Johan
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  #2  
Old September 5th, 2014, 09:26 AM
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i'd check your prop for wear, if there is play it might not be apparent under power with centrical force keeping it in place.

just my 2 pence
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  #3  
Old September 5th, 2014, 09:54 AM
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I don't fly props any more, only jets I will read up on prop shaft and figure out how to check. Makes sense with centrifugal force, since noise is not present under load. FYI transmission was just rebuilt and a Rover drive installed by a well respected Rover shop. Problem is I live far away from shop so I need to solve this locally. Thanks!!!
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  #4  
Old September 5th, 2014, 10:20 AM
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Jeff, sorry for my ignorance. Are you saying that with hubs locked and wheels turned by hand shaft should not be turning? It turns now and when hubs in "Free" it does not turn. Thx, Johan
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  #5  
Old September 5th, 2014, 10:22 AM
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Quote:
Originally Posted by JSBriggs View Post
The front shaft shouldn't even be spinning. Shift into low (red lever) drive a couple feet, stop, then back into high. that will get it out of 4wd.

-Jeff
I thought series trucks, like defenders were constant AWD, wouldn't that imply that the prop and shafts are always spinning? the locking hub is only to disengage the drive flange at the wheel to eliminate the resistance from the front drive?
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  #6  
Old September 5th, 2014, 10:43 AM
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Quote:
Originally Posted by NPT90 View Post
I thought series trucks, like defenders were constant AWD, wouldn't that imply that the prop and shafts are always spinning? the locking hub is only to disengage the drive flange at the wheel to eliminate the resistance from the front drive?
Nope, 2wd until 4wd engaged
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  #7  
Old September 5th, 2014, 11:02 AM
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With the hubs locked, the front prop spins....obviously...

Does the noise change when turning? It would be from the axle u-joints as well.
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  #8  
Old September 5th, 2014, 11:13 AM
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Hubs locked, truck on jacks. Spinning front wheels and shaft rotates. I am unable to duplicate any noise, just a mute "click" from area corresponding with each wheel revolution. When driving, noise is coming from area of transmission tunnel/differential. Not from hubs. Thanks.
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  #9  
Old September 5th, 2014, 11:38 AM
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Do you feel ANY slack in the u-joints? It does not take much. Beyond the u-joints, you would need to start pulling things apart to locate the problem.
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  #10  
Old September 5th, 2014, 11:40 AM
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Quote:
Originally Posted by Red90 View Post
Do you feel ANY slack in the u-joints? It does not take much. Beyond the u-joints, you would need to start pulling things apart to locate the problem.


Maybe worn splines at the slip yoke.
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  #11  
Old September 5th, 2014, 11:44 AM
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Thank you everybody. This has far exceeded my skill level. I will take my 88 to Mike Sandone at North American Overland. Fortunately his shop is nearby. Johan
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  #12  
Old September 5th, 2014, 12:09 PM
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Keep us posted because I'm always eager to learn.
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  #13  
Old September 5th, 2014, 12:18 PM
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Will do.
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  #14  
Old September 5th, 2014, 01:09 PM
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Make sure the front drive shaft yokes are phased correctly. If the drive shaft came apart and was reassembled incorrectly, you'll get the banging noise.
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  #15  
Old September 5th, 2014, 01:19 PM
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Quote:
Originally Posted by Johankos View Post
Thank you everybody. This has far exceeded my skill level. I will take my 88 to Mike Sandone at North American Overland. Fortunately his shop is nearby. Johan
Good call, Mike is a great guy and very solid tech.
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  #16  
Old September 5th, 2014, 07:55 PM
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Update, drove around for an hour today. Truck makes noise with hubs unlocked too. I can turn off engine and roll forward or backwards and hear noise. Going to shop on Monday for repair/diagnosis.

Johan
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  #17  
Old September 5th, 2014, 10:11 PM
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Sounds like the parking brake is not adjusted properly. If you have eliminated, loose ujoints/slipjoints in the drive shafts and no noise in the diff. It is a common enough issue that with proper adjustment will go away.

hth
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  #18  
Old September 8th, 2014, 10:49 PM
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Shop is trouble shooting truck. Starting with replacing a worn drive shaft. Next is a possible u-joint issue.

Johan
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  #19  
Old September 13th, 2014, 11:59 PM
Greg S
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Front hubs unlocked and in two wheel drive? Still does it?

As said IT IS YOUR PARK BRAKE. It isn't releasing all the way or you have it pulled one or two clicks. It grabs slightly at low speed and makes a God awful banging noise just as you start and just as you come to a stop.
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  #20  
Old September 14th, 2014, 03:53 AM
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Thank you Greg, I will tell the shop before I spend any more money!

Johan
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