Clunk or binding at low speed - Defender Source
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  #1  
Old August 27th, 2013, 10:51 AM
Hudson
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Clunk or binding at low speed

Fairly recently I had a new clutch installed and transmission/transfer case resealed by a trusted British shop. Ever since, I've noticed a moderate to severe rhythmic clunk when I'm just about stopped. Sometimes it's just a noise, but other times it's enough to bounce the suspension. It doesn't seem to matter if the clutch is engaged or not, and there are no other issues with noises while turning, accelerating or decelerating at speed, or reversing. The driveshafts don't seem to have any play in them either. Any ideas on what this might be?

This is on my 1987 110
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  #2  
Old August 27th, 2013, 11:00 AM
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Chris
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Don't like the sound of this. Go underneath and see if they forgot a few cross-member or gearbox mounting bolts or similar.
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  #3  
Old August 27th, 2013, 02:13 PM
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U joint ?
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  #4  
Old August 27th, 2013, 02:20 PM
Hudson
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Quote:
Originally Posted by Rocky View Post
Don't like the sound of this. Go underneath and see if they forgot a few cross-member or gearbox mounting bolts or similar.
I just got a chance to check the mounting and cross-member bolts and they are all tight (and new bolts with either locktite or nylock nuts). That was a relief!

The U joints don't have any play that I can feel and they look well greased. Is there another test I should be doing there? The noise and shudder aren't present at any other time besides coming to a stop under 5mph or so.
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  #5  
Old August 27th, 2013, 02:30 PM
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Sort of sounds like the CDL is engaged.
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  #6  
Old August 27th, 2013, 03:46 PM
Hudson
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Quote:
Originally Posted by down_shift View Post
Sort of sounds like the CDL is engaged.
I had thought that initially as well... that maybe the shop was verifying the function of the diff lock after putting everything back together. When I was back home in my driveway that day, I shifted the transfer case through all positions to be sure I was fully engaged in non-lock high, but never drove around.

On my lunch break today I pulled into a vacant lot and engaged the difflock, drove a few feet, then disengaged and backed up a good amount to be sure it disengaged fully. I only had time to drive a few more blocks, but the clunking didn't happen. I'll test it some more after work and report back.
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  #7  
Old August 27th, 2013, 06:51 PM
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Radius arm bushing. That's what I have going on. Same symptoms as you only mine doesn't do it when it's dry out, only when it rains.
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  #8  
Old August 27th, 2013, 07:07 PM
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Quote:
Originally Posted by solarguy View Post
Radius arm bushing. That's what I have going on. Same symptoms as you only mine doesn't do it when it's dry out, only when it rains.
Along these lines, I was actually thinking the A-arm ball joint, since it exhibit symptoms as you describe. If the shop had it hanging on a lift (which I'm assuming they did), maybe that stress of the rear hanging could have done it in (if it was on its way out to begin with).
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  #9  
Old August 27th, 2013, 07:46 PM
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Sounds like a consensus is forming and I like it! The noise came back on my drive home from work so my diff lock trick didn't work. Will check A arm ball joints next... Thanks guys!
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  #10  
Old September 29th, 2013, 10:10 AM
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After a lot of procrastinating, I got the new a-frame ball joint installed. The old one was bad without a doubt and everything was seized solid with rust. However the clunk is still there, just more muffled now. It only happens when coasting to a stop, with or without braking, but not when engine braking. What is the next thing I should check?
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  #11  
Old September 29th, 2013, 09:21 PM
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I had a similar issue and it was a sticking parking brake. Use a long screw driver, or similar, and see if you can move the lever from underneath the truck. Mine moved a 1/4 or so but it was enough to fully disengage the brake.
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  #12  
Old September 29th, 2013, 09:49 PM
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Your diff lock could be out of adjustment, but that's easy to check.
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  #13  
Old September 29th, 2013, 11:25 PM
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Jeff: I'll check out the bushings. Judging by the rest of the truck, I'm sure they're shot

lordhelemt: after you disengaged the brake, did you just never use it again, or is it a one time thing?

Jymmiejamz: I've never read anything about checking diff lock adjustment, and I suspect this might be the culprit as the problem started after a shop rebuilt my transfer case. How do I check?
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  #14  
Old September 30th, 2013, 07:21 AM
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My brake is sticking so I'm not using it right now. The Phillips head screw that holds the drum on is stripped so I need to tack a bolt on to it to get it out. I just haven't had time to get into it and see what is actually keeping the brake to completely disengage. I suspect something needs to be lubed or I need to replace the drum springs. Ill post what was the issue if I get to it soon. It's on my very long list of things I need to get too. In the meantime I keep a pry bar in the truck in case I forget and engage the brake
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  #15  
Old September 30th, 2013, 07:29 AM
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Quote:
Originally Posted by Hudson View Post

Jymmiejamz: I've never read anything about checking diff lock adjustment, and I suspect this might be the culprit as the problem started after a shop rebuilt my transfer case. How do I check?
Jack both front wheels off the ground and see if you can turn them both the same direction. If the centre diff is fully unlocked you should be able to turn them, if it is locked they won't turn.
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  #16  
Old March 24th, 2015, 03:56 PM
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having same issue

and was wondering if you found a solution?
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  #17  
Old March 24th, 2015, 04:05 PM
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My read on this is the parking brake.
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  #18  
Old March 24th, 2015, 04:09 PM
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Quote:
Originally Posted by Red90 View Post
My read on this is the parking brake.

So, as you're slowing down, the parking brake is "grabbing" and causing the clunking? For a shade tree, what is the easiest way to check this out?

Thanks so much!

KCD
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  #19  
Old March 24th, 2015, 04:12 PM
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Quote:
Originally Posted by Red90 View Post
My read on this is the parking brake.
100% ... if i drive with the parking brake on it's exactly as described.
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  #20  
Old March 24th, 2015, 04:19 PM
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That would be my guess. Try adjusting it per the manual first.

It can never hurt to pull it and give it an overhaul. Everyone should learn how to do it. Mine comes off at least every couple of years.
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