Drained 82 rear end
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4th Gear
Joined: Jul 2010
Posts: 4
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Drained 82 rear end
I pumped out my 82 rear end to put in new lube and the old lube was silver. I did not see any chunks just a silvery color lube. I did not feel anything wrong with it when I felt the old lube between my fingers.
I do not have any rear end noise, and my miles are about 87k
Since I have never had another posi rear end, I am not completly sure of what I am seeing.. I am concerned, should I be?
I do not have any rear end noise, and my miles are about 87k
Since I have never had another posi rear end, I am not completly sure of what I am seeing.. I am concerned, should I be?
Racer
Joined: Feb 2008
Posts: 497
Likes: 0
From: Streator Illinois
I would do one of two things. Either let it sit for a few days and then slowly pour into another container and check the bottom of the first container for tiny metal flakes. Or I would mix it up and pour thru a coffee filter and see what gets filtered. I know from past experience when draining the lower unit on an outboard boat engine or I/O unit that a coppery color indicates excessive wear of bushings, etc.
I'm sure others will chime in. Maybe it's just a sign of normal gear wear. Since you don't know what additives have been put into the rear, you can hope that the color is from that but I'd say you are right to at least be concerned.
Terry
I'm sure others will chime in. Maybe it's just a sign of normal gear wear. Since you don't know what additives have been put into the rear, you can hope that the color is from that but I'd say you are right to at least be concerned.
Terry
Drifting
Joined: Jul 2009
Posts: 1,534
Likes: 14
From: Dallas-Fort Worth TX
Well I had my diff rebuilt. I am surprised the damn thing had not burned/locked up before I pulled it myself. It was leaking at both half shafts and drive shaft. Guess the seals were gone. Had a nice coating of diffy lube scattered all underneath the rearend. Is yours leaking? If its not making noise or leaking refill it and add the posi additive. You will know when it goes south on ya. Drive it.
Safety Car
Joined: Nov 2008
Posts: 3,717
Likes: 551
From: Seattle Washington
As mentioned above the Yokes and Pin are Wear areas. Also the Posi Unit Clutchs tend to wear and when they do they start to rub on one end of the Carrier Unit and dump metal into the Oil. Once this all happens the Bearings will be short lived. The next step is to remove the Batwing and have a look inside to see whats going on. Or just change the Oil and do it again in 500 miles and see what it looks like then. If all of the above is wrong pretty much every internal part is going to get replaced anyway so your not going to do more harm by driveing it. Lets hope the Oil is clean next time.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Could be as simple as normal clutch plate wear particles in the lube. If so, that would not be a problem...just an indicator of significant plate wear. I'm not sure how you would tell the difference between that and some gradual erosion of housing/carrier wear, unless you did an oil analysis to determine the composition of the particulate.
If it were me and I didn't see anything but very fine particles in the lube, I'd probably add new lube & positrac additive, then wait until a leak started, noise increased, or operational behavior changed.
Folks who work with differentials regularly might have more specific knowledge and advice on this one.
If it were me and I didn't see anything but very fine particles in the lube, I'd probably add new lube & positrac additive, then wait until a leak started, noise increased, or operational behavior changed.
Folks who work with differentials regularly might have more specific knowledge and advice on this one.
