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Old 09-16-2007, 12:18 PM   #1
AKbowHUNT
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Default Early Bronco CLUNK CLUNK CLUNK

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Old 09-16-2007, 05:43 PM   #2
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Default Re: Early Bronco CLUNK CLUNK CLUNK

The clunk go away if you hit the brake while in the turn?
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Old 09-22-2007, 11:05 AM   #3
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Default Re: Early Bronco CLUNK CLUNK CLUNK

do you have a detroit in the back? Im thinking u-joint on the rear yoke.
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Old 09-22-2007, 12:00 PM   #4
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Default Re: Early Bronco CLUNK CLUNK CLUNK

Since it is doing it in and out of 4 wheel drive it should be in the rear end not the front end.

Do you know what differentials you have? detroit, tracloc, open?

Sounds like you either have a Detroit and it is just ratcheting, but it should do that doing left and right turns.

Or you have a bad set of spider gears or a bad wheel rear wheel bearing. You might want to pull your left rear axle shaft and see what condition the splines and wheel bearing are in. Thats pretty easy to pull, one wheel/ tire and four bolts.
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Old 09-23-2007, 02:22 PM   #5
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Default Re: Early Bronco CLUNK CLUNK CLUNK

what does it mean when the driveshaft rotates almost 180* before the wheels start to move?
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Old 09-23-2007, 04:00 PM   #6
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-23-2007, 11:23 PM   #7
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Default Re: Early Bronco CLUNK CLUNK CLUNK

Sounds like something is not happy. But you have some kind of limited slip or something else in there. Usually when the rear is wide open, you spin the one tire one way the other tire spins opposite. A detroit is not always engaged. It opens and makes a clunk, but it isnt ususaly as severe as that. Pull the pumpkin out and see if you got the metal soup.
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Old 09-24-2007, 03:16 AM   #8
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Default Re: Early Bronco CLUNK CLUNK CLUNK

So with the rear tires on the ground and the transmission/transfercase in neutral you can turn the rear pinion almost 180? This is pretty common for Detroit lockers. Normally they have a little less play but as they get older it will get up there.

Never mind after watching your video I can tell you something is broke in the rear end. They are not supposed to make all those clunking/ ratcheting noises.

Did the previous owner tell you what gears and differentials it had in it?

From what you have told us and from your video I am guessing you have a broken Detroit locker or broken axle shaft. Then again you could have one seriously worn out ring and pinion/broken carried cap/bad carrier bearings. Either way you need to pull both rear axle shafts and drop the center section. Takes all of an hour while having a few cold ones.
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Old 09-24-2007, 09:50 AM   #9
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-24-2007, 10:10 AM   #10
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Default Re: Early Bronco CLUNK CLUNK CLUNK

Yeah its probably better to check it then go on the trail. I broke a cap one time, probably hotrodding on the street, had a funny vibration. Made it to the trail and was doing a hill climb and boom. Some one came running up and said, You put a hole in your rear diff. I get out and the rear of the bronco had a nice cut in the back of the housing where the ring gear came loose and sliced a nice 3 inch cut in the back and gear oil was gooshing out. LOL. That was the only time i had to be towed home, and that was on the backside of the rubicon. Pretty expensive. so might as well pull it Hope things are not too bad.
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Old 09-24-2007, 07:06 PM   #11
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Default Re: Early Bronco CLUNK CLUNK CLUNK

pblackb592 here I was thinking I was the only one that managed to break the carrier bearing caps on my 9". Did mine doing burnouts with 40" tires. Not a good combination but I had to show up a Toyota Landcruiser doing them with 40's.

AKbowHUNT heck you still have all week to tear her down and fix her back up, why wait till the weekend?
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Old 09-25-2007, 09:06 AM   #12
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-25-2007, 09:44 PM   #13
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-25-2007, 11:48 PM   #14
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Default Re: Early Bronco CLUNK CLUNK CLUNK

You got me! Maybe part of the infamous Ford traclock? Those things are well known for grenading under normal use. Does not appear to be part of a Detroit. But you never know after being ground up. On the other hand your ring and pinion look nice!
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Old 09-26-2007, 06:27 AM   #15
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Default Re: Early Bronco CLUNK CLUNK CLUNK

what is that there behind the ring gear. the shiney thing. it looks kinda detroitish to me.
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Old 09-26-2007, 07:58 PM   #16
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Default Re: Early Bronco CLUNK CLUNK CLUNK

I say detroit too! what a few more bolts and pull the 3rd. Everything looks nice so far.
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Old 09-26-2007, 09:36 PM   #17
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Default Re: Early Bronco CLUNK CLUNK CLUNK

It very well could be a Detroit. Just spin the diff around and if it only has two aces holes and you can see a large spring in there then that is what it is. I know an Auburn POS looks a lot like one as well. Just never seen a piece of spring like the one pictured above come out of a Detroit. Then again anything can happen in a rear or front end!
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Old 09-27-2007, 11:41 PM   #18
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-27-2007, 11:54 PM   #19
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-28-2007, 12:00 AM   #20
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-28-2007, 12:02 AM   #21
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Default Re: Early Bronco CLUNK CLUNK CLUNK

that spring looks like a pinion seal spring.. or any oil seal spring it goes inside the seal to provide some tension.
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Old 09-28-2007, 12:04 AM   #22
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Default Re: Early Bronco CLUNK CLUNK CLUNK

Could be a wheel seal too...


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Old 09-28-2007, 12:30 AM   #23
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Default Re: Early Bronco CLUNK CLUNK CLUNK

How easily do your rear axle bearings spin now that you have taken the axle shafts out? The left one looks a bit rusty on the outside like that has been leaking out of the seal on it.

The spring is either from an axle shaft seal or a pinion seal.

The metal?

Can you take a picture through the hole in your differential? One from each side.

Your wear patterns look good and the rust is nothing to worry about. Just a bit of condensation was in the axle when it was parked for a bit and caused some surface rust. You could rub it off with a green scotch brite if you want.
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Old 09-28-2007, 08:17 PM   #24
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Default Re: Early Bronco CLUNK CLUNK CLUNK

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Old 09-28-2007, 11:13 PM   #25
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Default Re: Early Bronco CLUNK CLUNK CLUNK

Its pretty easy to take apart the diff to check it out. All you do is pull the two bearing caps(make sure you keep the right on the right and the left on the left and orientated upside up). Then take the ring gear off. Now you will see a couple of screws unscrew them and the diff will come apart so you can inspect it.

I would go ahead and replace both wheel bearings just to be on the safe side. Those old sealed bearings have the bad habit of failing when you least expect it and they are what hold your axle shafts in.

If I was in town now I would give you a hand with that diff but I am sure there are some other guys on here that will be more than willing to give you a hand.
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