Rear End Noise Under Sharp Turns - JeepForum.com
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post #1 of 16 Old 03-29-2007, 07:23 AM Thread Starter
Briandl
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Rear End Noise Under Sharp Turns

Whenever I make pretty sharp turns, and I don't mean small turns like to turn from one street to another, more like a u-turn type turn, I get a sound from the rear like a RUUUR RUUUUR RUUUR, it's very deep.

I don't know what rear end I have but it's a 2002 two wheel drive.

I haven't checked the fluid in the rear diff yet, but I plan to check it and see how it looks, no idea which diff it is either.

That's the only thing I could think to check, could probably also be drive shaft, or axle related, like shafts or something?

TIA!


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post #2 of 16 Old 03-29-2007, 10:20 AM
Wheelin98TJ
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Sounds like you have a limited slip and the clutches are grabbing.

You can try changing the diff fluid and adding the correct amount of limited slip additive. Then go do 10-12 tight, slow figure-eight turns. This gets the lubricant through the clutches and will often correct a chattering condition.
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post #3 of 16 Old 03-29-2007, 11:08 AM Thread Starter
Briandl
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Well here's an update:

I pulled the plug off the rear differential and the fluid came pouring out so it's not low.

I've attached a picture of the fluid and although I don't know if it's the right weight or if it has the correct additives, it certainly looks relatively clean to me, but I've never seen it straight from the bottle:


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post #4 of 16 Old 03-29-2007, 12:23 PM Thread Starter
Briandl
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So I checked my build sheet and I do have an LSD

3.73 Dana 44...

Should I look at changing out the fluid or should I look to just add more friction modifier?

I've read a thread here or on JU where someone took their Jeep in for a similar problem and the dealership just added more friction modifier.

TIA!

-----------

EDIT: If I have to change the gear oil:

The dealership said the 75-140 oil is 26.00 a quart, and it takes 2 1/2 quarts!

I know it's not something I'll have to change that often if ever again, but 85.00 for that and the friction modifier seems steep.

I assume I can get something at a local parts store, anything in particular I should look for, or avoid, obviously it needs to be 75-140.

Should I get one with the modifier in it, or should I buy a seperate bottle? Should I get the gear oil at a parts store and the modifier from the dealership?

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post #5 of 16 Old 03-29-2007, 12:33 PM
Wheelin98TJ
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Just change out the fluid. Having too much friction modifier in there will reduce the effectiveness of the limited slip.

You can get 75-140 from the auto parts store. It will be $10-15/quart. I believe all of them already have the friction modifier included since it will be synthetic fluid.

You might still have to add more friction modifier. The FSM calls for 2.5 oz. I usually just get it from the dealer because its pretty cheap - about $6 a bottle.

2.5 quarts is the correct fill capicity of the D44a.
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post #6 of 16 Old 03-29-2007, 12:36 PM Thread Starter
Briandl
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I'll let you know how it goes, and thanks so much for the help.

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post #7 of 16 Old 03-29-2007, 07:52 PM Thread Starter
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I got Trans-X and Mobil 1 75W-140.

The Tranx-X is seven ounces and it calls for the whole bottle, does that sound right?

Going by that the whole bottle would be too much...

EDIT: Read some Jeep stuff, FSM, service schedules, no question it's 4 oz, should I stick with that or go with the directions on the bottle?

I'm guessing they are being generic because the ammount of gear oil varies from diff to diff, and they'd probably rather have you put too much than too little.

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Last edited by Briandl; 03-29-2007 at 08:06 PM.
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post #8 of 16 Old 03-29-2007, 08:07 PM
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Go with what the service manual says. Don't add too much friction modifier!
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post #9 of 16 Old 03-30-2020, 09:27 AM
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My 1999 JGC Ltd w/ AWD has rear end chatter going on, when turning slow, left hand turns only. Changed the rear-end oil and added the standard friction modifier, and STILL is making noise. Sounds like its time to have the rear-end pulled pulled and rebuilt, to my uneducated ear/eye/mind. She's got about 150k on her, and I've been very very good about oil/service over the years. Driving straight, or at speed - is no problem. Its got to be the clutches in the LSD me thinks. Penny for y'all's thoughts...Ö thanks!!
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post #10 of 16 Old 04-01-2020, 08:17 AM
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Quote:
Originally Posted by WillieD56 View Post
My 1999 JGC Ltd w/ AWD has rear end chatter going on, when turning slow, left hand turns only. Changed the rear-end oil and added the standard friction modifier, and STILL is making noise. Sounds like its time to have the rear-end pulled pulled and rebuilt, to my uneducated ear/eye/mind. She's got about 150k on her, and I've been very very good about oil/service over the years. Driving straight, or at speed - is no problem. Its got to be the clutches in the LSD me thinks. Penny for y'all's thoughts...Ö thanks!!
Wile im not super familiar with the clutch style LSD setups I think instead of rebuilding the whole rear end you may just need to replace the clutch packs in the diff.

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post #11 of 16 Old 04-01-2020, 08:56 AM
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Quote:
Originally Posted by WillieD56 View Post
My 1999 JGC Ltd w/ AWD has rear end chatter going on, when turning slow, left hand turns only. Changed the rear-end oil and added the standard friction modifier, and STILL is making noise. Sounds like its time to have the rear-end pulled pulled and rebuilt

Clutch pack failure is extremely common with Dana trashlock. Buy an LSD rebuild kit, pull the carrier, install new clutch packs, install carrier, fill up and drive. While carrier is out, inspect carrier bearings for wear.


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post #12 of 16 Old 04-01-2020, 10:12 AM
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Yeah the Trak-Lok plates tend to break over time. Pretty easy to change out, need to pull the carrier but don't need to remove the ring gear. I used the Yukon clutch pack kit (YPKD44HD-PC-T/L).

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post #13 of 16 Old 04-02-2020, 03:50 PM
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WillieD56 has a Vari Lok diff since it is AWD.

No replacement parts available. Has to be replaced as an assembly.

I'd try adding a little more friction modifier first.
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post #14 of 16 Old 04-02-2020, 03:59 PM
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Quote:
Originally Posted by Wheelin98TJ View Post
WillieD56 has a Vari Lok diff since it is AWD.

No replacement parts available. Has to be replaced as an assembly.

I'd try adding a little more friction modifier first.

Haha, right you are - been a long time since a WJ post from before the divide got bumped up, and by another WJ owner no less.

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post #15 of 16 Old 04-02-2020, 10:04 PM
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Originally Posted by CatSplat View Post
Haha, right you are - been a long time since a WJ post from before the divide got bumped up, and by another WJ owner no less.
True that. I also failed to see that the post was related to a WJ.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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