GTO JUDGE

ahhhh I wasn't aware the F.M. was in their oil. Nice to know.

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President : SVGTO Tigers

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raspantienator

Glad to see you guys changing it. Dealer would not change mine because it was not covered and it is not suggested to be changed at 14000 miles.
They sent me another "Clunking" GM Alert noting that the noise is normal and no service is recommended.
I'll attempt the change next summer.

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gm4life

I discoved it when I went shopping for good gear oil that I can just go and buy. I was the third and last gear oil I put in my diff when I was having problems with it. Finally got replaced under warranty.
I'm gonna give ya some advice about the problems I had with my pumpkin. I was having the clunking and grinding noises going on with mine until I brought it in to the dealer. Mine done it after the fluid would heat up, during a nice highway drive. When I dropped my car off at the dealer I told them that the time is now to take the car for a drive to see what I'm talking about, I don't want the car back with no solution. A "tech" rolled with me to check it out, he tried to convence me that a simple fluid change would solve the problem and that GM has a new gear oil to solve that problem because Corvettes have the same one. I told him I performed two myself with the correct amout of limited slip additive with two differant good gear oils. So he changes his story to suspension clunk, I fired back so why it only does it after a good drive when the fluid warms up and when I let in and out the clutch in reverse, and going round corners. Later on in the week they replaced it saying that the carrier was bad. With all that useless typing I just did the moral is don't let GM tell you what wrong with the car you tell them whats wrong with it(if your knowledgeable). Also if it gets bad have it replace under warranty while you still have it.


Sorry for the hyjack. To change your gear oil the vary most bottom bolt of the diff is the drain. The largest bolt with the LSD tag on it toward the center is the fill.

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2004 QS/M12 w/mods
http://www.ageranger.com/

svede1212

i used the Royal Purple for a while. i switched to Torco and used the Ford friction modifier. it works better now and is quieter

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2004 Blk/Rd M6
12.34 ET, 113.55 MPH 1.82 60ft


DIY OTRCAI|!MAF|HP Tuners|SLP LTs|FTI cam|SLP UD|BBK 80mm TB|2.5" Exh

Rip Shift|DiffTechshaft|Diamond Stg3 clutch|BFG DRs|Lovells springs|Koni|Harrop cover|SuperPro bushes|Hotchkis sways|3.91s

04GTODKH

I just changed my Diff and transmission fluid .I am using Royal Purple as well, and haven't noticed any noise yet from the Diff. And to be honest I can't really tell any difference between the Royal Purple vs the GM stuff in the Diff.