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DIY: Rear Differential Oil Change

Which Diff oil should I use? Redline 75w90NS Gear oil quarts and cases (w/o friction modifier) or Redline 75w90 Gear oil quarts and cases (w/friction modifier)

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Old 12-15-2009, 02:55 PM   #16 (permalink)
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Which Diff oil should I use?

Redline 75w90NS Gear oil quarts and cases (w/o friction modifier)
or
Redline 75w90 Gear oil quarts and cases (w/friction modifier)
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Old 12-15-2009, 05:31 PM   #17 (permalink)
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I think I used the 75W90 (no NS designation). Honestly, I never knew there was even a second option.
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Old 12-15-2009, 11:06 PM   #18 (permalink)
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^ this question was raised on another thread as well. Don't use the NS version as it is not meant for hypoid LSD's.
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Old 02-07-2010, 11:28 PM   #19 (permalink)
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Just did my diff and man was that stuff nasty! Thanks for the DIY spearfish, +1
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Old 02-07-2010, 11:29 PM   #20 (permalink)
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I will be doing my rear diff change soon. Can't wait to smell the stuff!!!
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Old 02-09-2010, 08:05 PM   #21 (permalink)
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Quote:
Originally Posted by Zeto View Post
Just did my diff and man was that stuff nasty! Thanks for the DIY spearfish, +1
No problem . Between the transmission and the diff changes, the diff was visually more pleasing to change. The amount of junk that came out was impressive. However, I didn't notice any driving difference. The tranny however had pristine looking fluid come out, but it shifts like butter now. Go figure.
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Old 02-09-2010, 08:06 PM   #22 (permalink)
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Quote:
Originally Posted by m4a1mustang View Post
I will be doing my rear diff change soon. Can't wait to smell the stuff!!!
Just don't get it on your hands. It's like the acid saliva from Alien. (but not corrosive, just nasty)
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Old 02-10-2010, 07:51 AM   #23 (permalink)
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Quote:
Originally Posted by spearfish25 View Post
No problem . Between the transmission and the diff changes, the diff was visually more pleasing to change. The amount of junk that came out was impressive. However, I didn't notice any driving difference. The tranny however had pristine looking fluid come out, but it shifts like butter now. Go figure.
was there a lot of crap on the magnetic drain plug?

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Just don't get it on your hands. It's like the acid saliva from Alien. (but not corrosive, just nasty)
i like to refer to it as the devil's piss.
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Old 02-10-2010, 07:53 AM   #24 (permalink)
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Quote:
Originally Posted by spearfish25 View Post
Just don't get it on your hands. It's like the acid saliva from Alien. (but not corrosive, just nasty)
Oh I will make sure to have on some gloves!
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Old 02-10-2010, 09:27 AM   #25 (permalink)
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Quote:
Originally Posted by tranceformer View Post
was there a lot of crap on the magnetic drain plug?.
It was my first time and yes there was. Make sure you clean it throughly.
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Old 02-10-2010, 09:48 AM   #26 (permalink)
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Some pics from when I changed my fluid a couple weeks ago. So you guys can see the drain and fill locations.

Sorry they're so large and some are blurry.



Drain Plug


Fill Plug

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Old 02-10-2010, 04:24 PM   #27 (permalink)
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Quote:
Originally Posted by tranceformer View Post
was there a lot of crap on the magnetic drain plug?
Here's what mine looked like



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Old 02-10-2010, 04:44 PM   #28 (permalink)
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Just for reference, but how often should you change your differential and transmission fluid?
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Old 02-10-2010, 05:05 PM   #29 (permalink)
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Don't recall of the top of my head but it is in your service manual - its the first big service IIRC...
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Old 02-10-2010, 08:14 PM   #30 (permalink)
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IIRC it's something like 30k miles, but IMO if you're really hard on the car it wouldn't hurt to do it more often.
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