Weird Vibration on my 99 DII?

[LANDY96]

Well, for starters I have had this vibration for a while now. It starts at 60-70mph. It goes away when I decelerate? I thought at first it was the double cardons, well, I looked up under it, the UJ's have been replaced already! Ok, so the rear is suspect now... well, I take the DS off, and look at the joint, it seems ok? I re-install the driveshaft, and check the diff. I pulled the plug, and the oil is milky, drop the drain, and there is metal ALL over the magnet! LOTS of metal....I am kinda bummed, but I clean the metal off, and put new oil in the diff. Well, the vibration has diminished QUITE a bit. I did not have time to check the front diff, I will do this in the next few days. My question, Do you think the rear diff is becoming toast? Or do you think it was just the bad oil? Thanks!

[02disco2]

Question, when was it changed last? I assume you bought this used, do you have the service history? Are the breather lines still attached to the front and rear axels?

[LANDY96]

Yes, I bought it used! No, I have no idea, when it was,or if it was ever changed! It looked that bad! I have to check the hoses, i never looked!

[Thor]

I think milky is water + oil mixed rapidly by the diff's action. That metal had to come from somewhere.

Save your pennies for an ARB set up and gears, or Detroit, or etc.

[bcampbe7]

When you say metal on the plug, what sort of metal? Chunks of metal or fine metal shavings? I think fine metal shavings are fine. Metal chunks are bad, mmmmmmmk...

Milky = oil + water

[LANDY96]

Originally Posted by Thor

I think milky is water + oil mixed rapidly by the diff's action. That metal had to come from somewhere.

Save your pennies for an ARB set up and gears, or Detroit, or etc.

Yeah, water for sure, I just wonder if the diff is dying, or is pitted causing the vibs? If it is, might just nurse it along, until it has to be changed?

[LANDY96]

Originally Posted by bcampbe7

When you say metal on the plug, what sort of metal? Chunks of metal or fine metal shavings? I think fine metal shavings are fine. Metal chunks are bad, mmmmmmmk...

Milky = oil + water

No chunks, just lots of shavings, LOTS, about and inch past the plug!
I guess if it has never been changed, and no telling how long the water was in there, it's not that bad!??

[bcampbe7]

You may want to seek professional opinion on this, but I wouldn't worry so much about metal shavings.
It sounds like the diff oil change you just performed was its first. The magnetic diff plug is used to catch the metal so that it does not circulate in the diff oil and really screw-up your diff gears.

[LANDY96]

Originally Posted by bcampbe7

You may want to seek professional opinion on this, but I wouldn't worry so much about metal shavings.
It sounds like the diff oil change you just performed was its first. The magnetic diff plug is used to catch the metal so that it does not circulate in the diff oil and really screw-up your diff gears.

That's my thought as well, I am really not going to worry about it! I am however going to change the front diff oil, and check the transfer case oil as well! Thanks for all your help! Merry Christmas!!!

[bcampbe7]

Originally Posted by LANDY96

Merry Christmas!!!

Merry Christmas to you too!

[Disco Mike]

Eric,
Did you get just metal filings or were there little chunks?
When the oil goes milky, you are frying you bearings.
Rovers are know for weak diffs, so if it starts to vibrate again, better pull it and consider a locker or anothe used Rover diff.
Mike

[LANDY96]

Originally Posted by Disco Mike

Eric,
Did you get just metal filings or were there little chunks?
When the oil goes milky, you are frying you bearings.
Rovers are know for weak diffs, so if it starts to vibrate again, better pull it and consider a locker or anothe used Rover diff.
Mike

Metal filings, I don't recal chunks! The thought had occured to me that the bearing could be shot, We shall see as time goes on, If it ends up toast, I will just put another diff in there.