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Old 09-11-2007, 11:17 PM   #1
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Tire Chirp and Locking Differential

Sometimes when I am driving on pavement and I shift up I get a bit of a tire chirp. Now this doesn't really bother me, but I am just trying to figure out why it is happening. Am I shifting at too high RPM's? Does this have to do with the gearing (4:11)? Maybe a combination of both? Could tire pressure cause it as well? As long as I'm asking, what exactly does 4:11 mean?

I also have lickright lockers, could this be related? I figured that the lockers would only cause an occaisonal chirp around corners if they were locked. Also, is it correct to assume that some popping is normal for a locking differential when cornering? Like I said, I am not too worried about the noise but I am always looking to learn something.

How often do you check the differntial fluid? What would you do to fix a leak? This isn't a problem currently, but I've been told to operate under the assumption that "if it doesn't leak its empty"..... so I want to be prepared

Thanks again!

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Old 09-14-2007, 05:50 AM   #2
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No one has any comments? How's a guy to learn around here?

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Old 09-14-2007, 09:18 AM   #3
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Well, I will answer to the best of my ability.

You will get some tire chirp when shifting aggresively with your lockers as they try to determine which wheel to put power to. It is irrelevant what gearing you have. But keeping the tires on each axle at the same pressure (within 1 pound) is pretty important to having quieter experience with your automatic lockers.

4.11:1 gearing means that for every 4.11 times your driveshaft turns, your axles will rotate 1 time.

I don't check my differential fluid very often unless I have a leak. It gets changed every couple of years (I only put about 1200 miles/year on it and stay out of the water). There are different fixes for differential leaks. It depends where they are coming from. If it is leaking around the cover, pull it off, clean it and reseal it. If it is leaking into the brakes/wheels, more than likely you have a bad seal/bearing on that side and it needs replaced. If you are getting a leak around the pinion yoke, you need to replace the pinion seal.

Hope this helps.
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Old 09-18-2007, 02:58 PM   #4
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I can only chirp my tires above 4500rpms
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Old 09-18-2007, 03:46 PM   #5
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I can only chirp my tires above 4500rpms
So you want a tire chirp? I'm guessing that is because it indicates a lot of power transfered to the road? Although I do have some decent power with the straight-6 and T-18 4 speed, I believe that my chirp is due to tire pressure. One of my rear tires seems to lose pressure quickly. I haven't taken the wheel off to get a real good look yet, but I haven't seen any punctures. I do hear a hiss when I get the pressure near the recommended road pressure. Could this be a bead issue? If so what can I do?
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Old 09-18-2007, 04:04 PM   #6
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Originally Posted by steveshra View Post
So you want a tire chirp? I'm guessing that is because it indicates a lot of power transfered to the road? Although I do have some decent power with the straight-6 and T-18 4 speed, I believe that my chirp is due to tire pressure. One of my rear tires seems to lose pressure quickly. I haven't taken the wheel off to get a real good look yet, but I haven't seen any punctures. I do hear a hiss when I get the pressure near the recommended road pressure. Could this be a bead issue? If so what can I do?
If it is a bead issue, you can take it to a tire shop, and they will take it off the bead and reseat it for you. That should take care of it. They will more than likely check to see where the leak is coming from before they dismount and remount a tire.
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Old 09-18-2007, 10:17 PM   #7
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If it is a bead issue, you can take it to a tire shop, and they will take it off the bead and reseat it for you. That should take care of it. They will more than likely check to see where the leak is coming from before they dismount and remount a tire.
Is there any way to reseat the tire myself so that I wouldn't have to take it to a shop? I know that they have a big specialized machine that they use, but I'm trying to do as much work myself as possible. It would be easy enough to take it to a tire shop, but I'm just stubborn
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Old 09-18-2007, 10:27 PM   #8
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First use soap and water and look for bubbles to make sure where it is leaking. If it's the bead, you may be able to break the bead lose from the rim by using a bumper jack. But, you may rip a sidewall too.
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Old 09-18-2007, 10:47 PM   #9
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I'll pop the tire off this weekend, inflate it up to recommended pressure, soap it up and look for the leak. If it is the bead I think I'll take it to a tire shop. If it is a hole, do you think one of those "fix a flat" cans for large tires would work? I also have a hole plug kit to use if the hole is not in the sidewall. If its a sidewall hole, the tire is basically garbage right?
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Old 09-19-2007, 09:13 PM   #10
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yeah if it is sidewall hole it is, but anything else can be fixed

sorry i didnt respond i would have but i havent been around, im usually all ove rthe CJ forum

but yeah
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Old 10-05-2007, 01:02 PM   #11
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Most shops won't touch a hole in the side wall, try taking it to a co-op and telling them its for an offroad only piece of equip. they will probably vulcanize it. Would still only use it offroad though.
Also, for the chirping, Does it do it with your foot on the clutch?

Also the above def. on 4:11:1 gearing is incorrect,
jack the rear up and you'll see that turning the driveshaft 4 times causes the tire to rotate 11 times.
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Old 10-05-2007, 01:48 PM   #12
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Actually - the first definition was correct. If your gear ratio is 4.11:1 the ring gear will turn once for every 4.11 turns of the pinion.

Here is a link that I looked up with it explained:
http://www.carcraft.com/techarticles...rks/index.html
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Old 10-05-2007, 02:00 PM   #13
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Actually - the first definition was correct. If your gear ratio is 4.11:1 the ring gear will turn once for every 4.11 turns of the pinion.

Here is a link that I looked up with it explained:
http://www.carcraft.com/techarticles...rks/index.html
Hmm, I always used it as the quick way to check axles in the junkyard for ratio, and always came out right.

I'll check again this weekend

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