diff noise gone
Thread Starter
Burning Brakes
Joined: Sep 2005
Posts: 987
Likes: 1
From: Braidwood Il.
diff noise gone
I have a 05 coupe and it had the rear end "clunk" anytime it was pulled out of the garage first thing in the morning.
I searched here on the forum and changed the fluid, replaced it with amsoil and the modifier, did some figure 8's and when I took it out in the am the noise was history.
I feel better and the car sounds better.
I searched here on the forum and changed the fluid, replaced it with amsoil and the modifier, did some figure 8's and when I took it out in the am the noise was history.
I feel better and the car sounds better.
Le Mans Master
Joined: Jan 2001
Posts: 6,453
Likes: 371
From: Maryville TN
St. Jude Donor '06-13,'16-'17, '19
I have a 05 coupe and it had the rear end "clunk" anytime it was pulled out of the garage first thing in the morning.
I searched here on the forum and changed the fluid, replaced it with amsoil and the modifier, did some figure 8's and when I took it out in the am the noise was history.
I feel better and the car sounds better.
I searched here on the forum and changed the fluid, replaced it with amsoil and the modifier, did some figure 8's and when I took it out in the am the noise was history.
I feel better and the car sounds better.
Tom
Race Director
Joined: Sep 2000
Posts: 11,146
Likes: 1,913
From: Missouri City, TX
AMSOIL Severe Gear is the real deal as I have done DIY changes on 3 pre-2009 model corvettes with great success. Severe Gear is already formulated with slip lock additive but a car already with severe chattering will benefit from a little extra added. AMSOIL also sells slip lock additive separately in a 4oz tube. JMHO.
Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)
AMSOIL Slip-Lock Differential Additive (Product Code ADATB)
For those interested, I’m happy to offer dealer wholesale prices, about 25% below retail, for forum members via the AMSOIL Preferred Customer Program. Drop me a PM if interested.
AMSOIL Slip-Lock Differential Additive (Product Code ADATB)
For those interested, I’m happy to offer dealer wholesale prices, about 25% below retail, for forum members via the AMSOIL Preferred Customer Program. Drop me a PM if interested.
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C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
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Michael S. Palmer
Instructor
Joined: Aug 2003
Posts: 249
Likes: 1
From: Round Rock TX
My 2007 is clattering bad! I took it to the dealer and they charged me to replace the fluid. It was WORSE after that. Could mine be too far gone for AMISOIL to work? If so, should the differential be covered under the powertrain warranty?
Race Director
Joined: Sep 2000
Posts: 11,146
Likes: 1,913
From: Missouri City, TX
Maybe not. My 06Z was chattering when my dealer told me about it during a separate service visit. They changed the fluid for free but it was before Dexron LS was introduced. Dealer said that there was a good chance the noise would come back but GM forced them to do a fluid change first before doing a clutch pack replacement. The chattering came within a month or two worse than before. In desperation to avoid major surgury on the rear end, I followed the advice here on the CF and used AMSOIL Severe Gear 75W90 plus additional AMSOIL slip lock additive. Never a problem after that day. Difference was immediate after doing the figure 8s. At one time prior to DEXRON LS being introduced, GM had a TSB that suggested using 2x the normal amount of additive. Since AMSOIL is already formulated with slip lock additive, I used only one additional bottle of additive. I would suggest you try AMSOIL and add separately 2-4 ozs of additive if your chattering is severe. Do 7-8 figure 8s in different directions in a empty parking lot afterward to work the additive in the clutch packs. If you try it, give us a report.
Last edited by GOLD72; Jun 5, 2012 at 12:31 PM.
Instructor
Joined: Aug 2003
Posts: 249
Likes: 1
From: Round Rock TX
Thanks, Gold72! I may give this a try. How long has yours been "silent"? I replaced the fluid myself a few months back with standard Mobil 1 synthetic and the clatter was immediately gone...for a few weeks. It quickly came back. If using AMSOIL is a long term fix, I'm all for it! If it's just going to comeback in a few months, I'd rather fight with the dealer to replace parts (if that is a long term fix).
Does anyone know if replacing parts (would it be doing a clutch pack replacement?) would be covered under the GM powertrain warranty? I'm about to the end of that warranty so I need to act fast.
Does anyone know if replacing parts (would it be doing a clutch pack replacement?) would be covered under the GM powertrain warranty? I'm about to the end of that warranty so I need to act fast.
Premium Supporting Vendor
Joined: Aug 2001
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From: King George VA
Race Director
Joined: Sep 2000
Posts: 11,146
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From: Missouri City, TX
Retired & lovin' it!
Joined: Mar 2005
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From: Jackson NJ
Guys....as a point of information, GM Dexron LS Gear Oil, p/n 88862624, is the later formulation that contains the corrected ratio of friction modifier. Nothing wrong with Amsoil or Royal Purple, but just another option.
Race Director
Joined: Sep 2000
Posts: 11,146
Likes: 1,913
From: Missouri City, TX
Severe Gear 75W90
4 oz tube of AMSOIL Slip Lock Additive
AMSOIL hand pump (optional)
Webpage: http://www.amsoil.com/
You will need a 10mm Allen wrench. You can get this as a 10mm Allen head set into a socket for a 3/8" drive wrench which is real convenient. A pipe cheater extension maybe helpful when breaking loose the Fill plug. Otherwise a long socket wrench. Space is cramp behind the right muffler. Try to level up the bottom of the car as much as possible when you go to refill the diff with the hand pump. Its full when the fresh fluid starts draining back out the Fill port. Whether your diff arrangement needs purchase of either 2qts or 3qts, it will not take the entire purchased amount. You will still have maybe a pint or more left over. I have changed the fluid on both diff types.
Last edited by GOLD72; Jun 6, 2012 at 01:08 PM.
Race Director
Joined: Sep 2000
Posts: 11,146
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From: Missouri City, TX
This is true. I used Severe Gear because DEXRON LS had not been introduced yet. AMSOIL and RP both include slip lock additive in their formulations. Adding it separately is only if you have severe chattering and adding more has to be done cautiously as Subdriver points out or otherwise our might over-do it and disable the positract function.
Melting Slicks
Joined: Dec 2006
Posts: 2,694
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Hey, have you done the cooled differential (GS) according to the service manual? It requires running the car at 'x' rpm in 2nd gear, or something like that, then shut engine off and immediately fill again until fluid comes out. I don't know how much more you can fit, due to cooler volume. Curious about your comments on that. I plan to do it by the book, which requires putting car on ramps in front and stands on rear (I already did that when swapping my '12 catted X-pipe with an '11 non-catted (OEM) one. Thx.
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Joined: Aug 2001
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From: King George VA
