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1998 WS6 differential noise question

This is a discussion on 1998 WS6 differential noise question within the Manual Transmission forums, part of the Drivetrain category; Good morning everyone, I am new to the LS1 forum. My husband and I have owned our 98 since 2000. ...

  1. #1
    Junior Member SeptemberC's Avatar
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    1998 Pontiac Trans Am WS6

    1998 WS6 differential noise question

    Good morning everyone, I am new to the LS1 forum. My husband and I have owned our 98 since 2000.
    He recently(2 weeks ago) performed the differential service and even now when doing the slow figure 8's he is still getting chatter noise.

    He used Lucas Synthetic and Trans X.

    Now we are trying to decide where to go and what to do from here. Do we try to add more Trans X? Do we start all over and use NO Trans X? Do we start all over and use Non-Synthetic and OEM additive?

    Any opinions would be greatly appreciated. Also, can someone confirm that the 98's have the Auburn differential?

    Pictures I attached below are just to show you how well taken care of the car is.

    https://photos.app.goo.gl/WiAYbQFSRfDe7NYf7

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    Did you add the limited slip additive?

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    Junior Member SeptemberC's Avatar
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    1998 Pontiac Trans Am WS6

    We added TRANS-X POSI-TRAC Limited Slip Gear Oil Additive is designed to quiet chattering differentials and improve gear oil performance. Use with conventional GL-5 or synthetic gear oils.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    what weight of oil did you use?


    when he drained it did he see any signs of bearing material or wear?

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    Junior Member SeptemberC's Avatar
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    We used Lucas 75-90 Synthetic. No debris, shavings, or any gear wear at all.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    To answer your question about Auburn differential.

    98 came standard with it though it is possible it could have come with the Torsen. Only way to tell is see if it has clutch packs (Auburn) or worm gears (Torsen).


    Mine was an Auburn. I now have a 8.8.


    Is the noise whine or chatter? Does it increase on decel or acceleration? In turns?

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    Junior Member SeptemberC's Avatar
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    There is a very small amount of whine on acceleration and deceleration at interstate speeds only. The chatter/squeak happens when making slow speed 90 degree turns, figure 8's & complete circles. So basically anytime that one wheel is travelling faster than the other. We have not had the transmission apart only the diff cover off. The gears looked BRAND NEW and we have LOTS of experience with gears. Of course you can't see the clutches. . .
    1998 Pontiac Trans Am WS6 & 1968 Camaro

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    How many miles?

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    Junior Member SeptemberC's Avatar
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    DAMN LOL ! I knew you were going to eventually ask that question. 103,021 . My husband drove it to work 85 interstate miles everyday. He is an old street / drag racer. He never drove this hard, raced it or abused it. We are old folks and he's torn up and rebuilt enough Camaro's in his youth. It only had 2500 miles on it when we bought it. No one believes that it has that many miles on it when they look at it for any reason. If he could keep this in our livingroom he would have.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    It wouldn't be a bad idea to do the bearings as well as the outer wheel bearings. While miles do grind them down, sitting still for long periods of time dry rots rubber seals and will allow moisture to find it's way in and go to work on them as well.



    The clutch packs on the rear are probably due too.

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    Junior Member SeptemberC's Avatar
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    Agreed. Bearings and clutches probably need replaced. However, do you think the current noise issues are due to the tired bearings and clutch plates or a differential fluid viscosity issue?

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    Senior Member TLS_Addict's Avatar
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    If it didn't make noise before and it's making it after the fluid change my money is on the fluid. As said though a rebuild kit isn't a bad idea at 100k miles.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    ^^this

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    Junior Member SeptemberC's Avatar
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    Thank you. We are going to do a fluid swap

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    Agree. Swap the fluid and try running the GM Posi additive.

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    Update: Fluid Swap and GM posi additive done. . . Still same noise but only after driving for 15 minutes or so. Forums are wonderful as a community coming together can offer a combined knowledge base. Having said that we also had a friend come over and drive it to give his 2 cents. This is what we have newly discovered - The noise stops completely if the clutch is pushed in. So, we are driving in a circle or figure 8. . . it starts making the noise, push in on clutch, the noise stops, let clutch back out, noise returns.

    So now what is it? and why did it only start after fluid change?

    and THANKS AGAIN for all of the responses.

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    Senior Member TLS_Addict's Avatar
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    I can't imagine a rear end makes noise based upon the clutch being engaged or not. Throw out bearing perhaps?

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    Junior Member SeptemberC's Avatar
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    We have come to this conclusion also. The sound must be traveling down the drive shaft. We will keep you posted! Thanks again for the support!

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    Spaz is My Mentor SMWS6TA's Avatar
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    Throw out bearing or even the pilot bearing. Cheap insurance to change the pilot bearing while there.

    But another important question, how old is the clutch? Original?

    If so time to look at a replacement, depending on how you abuse it, stock clutches last between 75-120k miles.

    You might still have enough clutch material to still get around but you can't be having too much left. Mine lasted till 108k miles when I had to change it.

    A drop in stock (well better than stock) is the LS7 clutch kit. For stock motors or even builds up to the 500 ft lb of tq, it is the go to clutch kit.

    I used it till I pushed past it's capability when I swapped to a 403ci.

    They usually go for around $500-550.

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