Hearing noises from the rear - Page 2 - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #11 of 17 (permalink) Old 12-23-2018, 06:56 PM
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The friction modifier is what you add to gear oil that doesn't already have it. If you don't want to deal with adding or mixing anything, the gear oil you want to use is 75W-85 GL-5 ZF LSD, Mopar part number 68083381AA. That's the the stuff the TSB said to put in to quiet the noise (Apparently some had the wrong fluid put in from factory, which may be your case). It has the right amount of carbon clutch additive in it already. It's not cheap but at least it won't take more than 2 liters. Then it's as simple as drain and refill.


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post #12 of 17 (permalink) Old 12-24-2018, 02:18 AM Thread Starter
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I am thinking that I will just drain and refill with some new oil and additive. The car has 73K on it so it might be wise to go ahead and change it out completely. Thanks everyone.

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post #13 of 17 (permalink) Old 12-24-2018, 07:26 AM
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I've notice the ZF limited slip diffs like a LOT of friction modifier.

I changed my diff lubricant out (new stuff had friction modifier) and added more to quiet it down.

It takes a couple hundred miles of driving for the modifier to absorb into the clutch material, so you don't notice the effects immediately.

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post #14 of 17 (permalink) Old 12-25-2018, 08:27 PM
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Here's my related post on Camaro6.

Note that the figure eight deal is to speed up the absorbtion of new fluid into the clutch discs.




Quote:
I just found GM's procedure for this noise correction - you're gonna love it!

Moan noise from the rear axle during cold start turning maneuvers.

In some instances the noise has been described as coming from the front of the vehicle.

The noise may start to be noticed as the vehicle accumulates over 3,000 miles.




Note: Steps 2 – 9 MUST be performed two (2) times for a total drain and fill of three (3) times to have this procedure be effective.

With original lube in axle, conduct Freeway Speeds for 10 miles to warm up lube.

Immediately drain original lube and refill with fresh lube

In parking lot lock steering to the right, and then execute 5 Full Circles at (5-10 mph).

In parking lot lock steering to the left, and then execute 5 Full Circles at (5-10 mph).

Perform 4 Figure 8’s at (5-10 mph).

Freeway Speeds for 20 miles until operating temperature is achieved.

In parking lot lock steering to the right, and then execute 5 Full Circles at (5-10 mph).

In parking lot lock steering to the left, and then execute 5 Full Circles at (5-10 mph).

Perform 4 Figure 8’s at (5-10 mph).

Immediately drain current lube in axle and refill with fresh lube

Perform Steps 3 thru 9 again.

Immediately drain current lube in axle and refill with fresh lube.
Quote:
The figure 8's work the new fluid into heated up clutch plates.

It should be made clear that there are 2 issues being addressed:

1. LSD clutches grab on corners when cold - Better fluid is the only hope. Insane fluid change procedure may or may not be required.

2. Ring and pinion gear whine going straight or on turns - may be cured with better fluid, or may require full diff set-up.


There's talk of the Mexican diffs not being set up properly. Too much Corona...:happy0180:

May need full set up and adjustment including backlash adjustment.
As @Hal H mentioned, plenty of slip lock additive is needed. I like Amsoil:





https://www.amsoil.com/shop/by-product/gear-lube/
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post #15 of 17 (permalink) Old 12-26-2018, 09:50 AM
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Just another data point here. I have a limited slip (or as dodge calls it anti-spin) diff and I changed the fluid with royal purple synthetic gear oil (same weight as OEM) and did not add any additional friction modifier. Only time I hear diff make noise (besides the high pitched whine around 45 mph) is at very low speeds and only when the car has been driven for some distance. It makes an almost inaudible groan (my friends and family don't even notice even when I point it out), especially while turning.


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post #16 of 17 (permalink) Old 12-26-2018, 12:10 PM
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Quote:
Originally Posted by ChallyTatum View Post
Just another data point here. I have a limited slip (or as dodge calls it anti-spin) diff and I changed the fluid with royal purple synthetic gear oil (same weight as OEM) and did not add any additional friction modifier. Only time I hear diff make noise (besides the high pitched whine around 45 mph) is at very low speeds and only when the car has been driven for some distance. It makes an almost inaudible groan (my friends and family don't even notice even when I point it out), especially while turning.
That is the symptom for insufficient additive. Continuing to drive it like this will result in accelerated wear on the clutch plates in the diff, best to go with the posi additive even if the oil supposedly already has it.


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post #17 of 17 (permalink) Old 12-26-2018, 12:22 PM
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Quote:
Originally Posted by Slidd View Post
That is the symptom for insufficient additive. Continuing to drive it like this will result in accelerated wear on the clutch plates in the diff, best to go with the posi additive even if the oil supposedly already has it.


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The diff has got issues so not too concerned about it. I have the replacement diff waiting along with 2 bottle of friction modifier.
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