diff chatter after fluid change
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diff chatter after fluid change
yesterday i replaced my diff fluid in my c5 with amsoil severe gear. after replacing the fluid i noticed a chatter coming from the diff at lower speeds and on some turns. i did figure 8s in a parking lot and the issue was still there so i got some gm lsd additive. I put 4 oz of the additive in and went back to a parking lot to do some figure eights. I am still experiencing chatter from the diff at low speeds/ when slowing down and on turns. the noise wasn't there before i changed the fluid so i am curious as to what the cause could be
Race Director
Joined: Oct 2004
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yesterday i replaced my diff fluid in my c5 with amsoil severe gear. after replacing the fluid i noticed a chatter coming from the diff at lower speeds and on some turns. i did figure 8s in a parking lot and the issue was still there so i got some gm lsd additive. I put 4 oz of the additive in and went back to a parking lot to do some figure eights. I am still experiencing chatter from the diff at low speeds/ when slowing down and on turns. the noise wasn't there before i changed the fluid so i am curious as to what the cause could be
) in my diff. I've also never had any trouble with my diff, either. 25 years old, and a 427 yanking on it for the last 20 years. Dozens of dragstrip launches. I just go to the Chevy dealer and get the factory fill, which includes the LSD special lube. I also changed the original lube at 100,000 miles. Hope this helps.....
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Amsoil makes really good stuff. I've never used their diff lube, however. So I don't know if you got the right stuff. I have never had anything but the GM lube (4032?? Can't remember) in my diff. I've also never had any trouble with my diff, either. 25 years old, and a 427 yanking on it for the last 20 years. Dozens of dragstrip launches. I just go to the Chevy dealer and get the factory fill, which includes the LSD special lube. Hope this helps.....
) in my diff. I've also never had any trouble with my diff, either. 25 years old, and a 427 yanking on it for the last 20 years. Dozens of dragstrip launches. I just go to the Chevy dealer and get the factory fill, which includes the LSD special lube. Hope this helps.....
Le Mans Master
Joined: Jul 2010
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Thanks for your input! I used the severe gear 75w90 which already has the limited slip additive in it. amsoil claims that if chattering happens after using said fluid then you should add in lsd additive. Even after adding in the lsd additive i still experience the same chatter so I can figure out what the issue is. my diff hasn't made a chatter before i changed the fluid which also leads me to believe that the issue isn't within the diff itself. Might go and buy some oem fluid and another bottle of additive if needed.
Intermediate
Joined: Dec 2021
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Had the same thing happen to me. I know Amsoil makes probably the best oil in the business, but when it comes to diff and trans fluids, I haven't been impressed. Try Motul Gear Oil 300 75-90 the one without the additive. Add some GM additive to the Motul and I bet you will be fine. I've tried almost every fluid for OIl, Diff and Tranny and Motul gear oil has been the best so far. Combined with Redline 30505 D4 in the Transmission have been the best combo shifting wise. Too soon for another transmission fluid change, but I;m sure Motul in the there will probably be just as good if not better. 01 Z06
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Joined: Oct 2004
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Thanks for your input! I used the severe gear 75w90 which already has the limited slip additive in it. amsoil claims that if chattering happens after using said fluid then you should add in lsd additive. Even after adding in the lsd additive i still experience the same chatter so I can figure out what the issue is. my diff hasn't made a chatter before i changed the fluid which also leads me to believe that the issue isn't within the diff itself. Might go and buy some oem fluid and another bottle of additive if needed.
Le Mans Master
Joined: Jul 2010
Posts: 6,013
Likes: 726
This is the same as trans fluid on 6mn, some have good luck with one brand and another with the same brand has ill effect. Dont know why but it's a fact.
Guess we'll know if he changes back to OEM and shutter is gone. That will prove every car componentes for some reason acts differently to the same product used.
Or it's just a coincidence has rear went bad at the same time of change fluid.
Guess we'll know if he changes back to OEM and shutter is gone. That will prove every car componentes for some reason acts differently to the same product used.
Or it's just a coincidence has rear went bad at the same time of change fluid.
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Race Director
Joined: Oct 2004
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Thanks for your input! I used the severe gear 75w90 which already has the limited slip additive in it. amsoil claims that if chattering happens after using said fluid then you should add in lsd additive. Even after adding in the lsd additive i still experience the same chatter so I can figure out what the issue is. my diff hasn't made a chatter before i changed the fluid which also leads me to believe that the issue isn't within the diff itself. Might go and buy some oem fluid and another bottle of additive if needed.
Drifting
Joined: Jul 2004
Posts: 1,677
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From: Pingree Grove IL
I’m no help, I don’t know what gear oil is in my RPM diff with 3.73 gear. Speed INC did the install. But almost 4 years and 15-20k miles on the new diff, and everything is fine so far. Probably wait another year or two before changing diff and tranny fluid.
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yesterday i replaced my diff fluid in my c5 with amsoil severe gear. after replacing the fluid i noticed a chatter coming from the diff at lower speeds and on some turns. i did figure 8s in a parking lot and the issue was still there so i got some gm lsd additive. I put 4 oz of the additive in and went back to a parking lot to do some figure eights. I am still experiencing chatter from the diff at low speeds/ when slowing down and on turns. the noise wasn't there before i changed the fluid so i am curious as to what the cause could be
Race Director
Joined: Sep 2000
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From: Missouri City, TX
PSA - GM introduced DEXRON LS 75W90 for MY 2009 as factory fill for all vettes and it has been excellent in preventing slow speed turn chatter so frequent with the previous factory fill formulation.
Advanced
Joined: Jan 2025
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From: Ontario
Good to hear as I have used AMSOIL Severe Gear 75W90 diff oil with some extra additive to stop slow turn chattering in 3 separate C6 vettes (06Z, 07 vert, 08 coupe) all very successfully. Really surprised your change induced issues.
PSA - GM introduced DEXRON LS 75W90 for MY 2009 as factory fill for all vettes and it has been excellent in preventing slow speed turn chatter so frequent with the previous factory fill formulation.
PSA - GM introduced DEXRON LS 75W90 for MY 2009 as factory fill for all vettes and it has been excellent in preventing slow speed turn chatter so frequent with the previous factory fill formulation.