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Old Jun 16, 2006 | 01:19 AM
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Default I just relized this...
I was driving my car around today and I was like great my differential still keeps making that noise. Then it hit me; it doesn't make that sound when the car is cold.... . I have to back out of my driveway every day for work and I finally relized that. When the differential starts to get warm when im driving on the highway then i have to make a turn that is when i start hearing this nasty squealing grinding noise. Why is this? I was thinking its because when it get warm the limited slip doesn't really work to its fullest making it slip and slide a lot easier but I could be wrong. Does anyone have an explaination for this happening like that?

keith
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Old Jun 16, 2006 | 01:20 AM
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You got it right. Add some new posi additive and you should be fine after 50 to 100 miles.
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Old Jun 16, 2006 | 01:21 AM
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Without going too much into detail, you need to drain it and add new oil and additive. Should fix that right up.
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Old Jun 16, 2006 | 01:23 AM
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Even better.
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Old Jun 16, 2006 | 01:31 AM
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Originally Posted by Greg
Even better.
Way I see it, you're down there, might as well do it all and forget it. Either method will probably work, but since I didn't know what was in there from before, I did the drain and refill.
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Old Jun 16, 2006 | 03:55 AM
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i got it done about a month ago the guy put the limited slip and oil in. I guess i might just have to get it done again to make sure all the debree is out. If i were to do it again would that help it out or if i just added more to what is in there?

keith
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Old Jun 16, 2006 | 08:16 AM
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Originally Posted by Rydin Dirty
i got it done about a month ago the guy put the limited slip and oil in. I guess i might just have to get it done again to make sure all the debree is out. If i were to do it again would that help it out or if i just added more to what is in there?

keith
Did your guy use GM Limited Slip additive or aftermarket? Lots of good information out there that the GM stuff is the way to go. Go to your local Chevy dealer and buy one (heck - buy two. I do) and add it. Once it is in and you have driven your car for a mile or so, find someplace where you can do full circles with the steering wheel completetly cocked to one side. Slow speed works fine. Then go the other direction. Then back it up doing the same thing. This ensures that the limited slip additive is introduced into the clutch packs.

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Old Jun 17, 2006 | 10:51 AM
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thanx a lot gary i will let u know what happens after i put the fluid in there.

keith
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Old Jun 17, 2006 | 01:23 PM
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Old Jun 17, 2006 | 01:55 PM
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My '74 rear end does that too. When I'm going slow, every few feet I hear a mild pop from the rear end. The differential is leaking. I guess I'll drain it and refill. Is it a pain to replace the seal?
BTW, how do you drain it anyway?
thanks
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Old Jun 17, 2006 | 02:44 PM
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Originally Posted by 90ZR1
My '74 rear end does that too. When I'm going slow, every few feet I hear a mild pop from the rear end. The differential is leaking. I guess I'll drain it and refill. Is it a pain to replace the seal?
BTW, how do you drain it anyway?
thanks
These differentials are drained by sucking the old lube out and then using the same suction gun to put the new lube in. Every auto parts store has them - quite cheap. You remove the large plug on the passenger side of the diff and insert the long hose. Pull the handle on the suction gun and then drain it. Repeat until you get mostly air. Next, add your GM Posi additive and enough differential lube until it starts to dribble out. Then go for a drive and do as I posted above.

I do not know of any easy way to replace the seal without dropping the diff. Never needed to.

Gary
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