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Rear Diff fluid change after 11,500 miles?

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Old 10-13-2012, 01:52 AM
  #21  
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Default Rear Diff

Drained out old fluid on both diffs at 750 miles to install 75w90 syn. fluid front diff looked new,rear diff. came out life crap. Those dana 44s must be built tight,non posi.
Old 10-13-2012, 03:52 AM
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I have the 373 gear with limited slip differential, so I'll need the supplement added to the rear. Is there any recommendations for this?
Old 10-13-2012, 05:06 AM
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Originally Posted by The Riz
Drained out old fluid on both diffs at 750 miles to install 75w90 syn. fluid front diff looked new,rear diff. came out life crap. Those dana 44s must be built tight,non posi.
You probably weren't in 4WD very much if at all during that 750 miles so there wasn't much load placed on the gears in the front diff.
Old 10-13-2012, 06:18 AM
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Originally Posted by Gman*2007
I have the 373 gear with limited slip differential, so I'll need the supplement added to the rear. Is there any recommendations for this?
I have the same in my D44. with the LSD.

I used Mopar 75W-140 gear lube with the Mopar Limited Slip Adative P/T# 04318060AB. It's a 4 FL OZ bottle, used it all last change, no issues what so ever.
Old 10-13-2012, 06:31 AM
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Dealer scam... Mine attempts to charge me $120 per diff but I always laugh. It's very simple to do this on your own. Look for one of the how-to's and start doing it yourself. I do mine 1 week after oil change or next following oil change if I didn't offroad any during that time.
Old 10-13-2012, 06:34 AM
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U don't need the additive if u use synthetic gear oil
Old 10-13-2012, 06:41 AM
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Originally Posted by drumnatural
U don't need the additive if u use synthetic gear oil
Agreed, when you go the Royal Purple route, they have it in the oil.

It's my understanding the MOPAR product which I used does not contain the additive, and is a seperate little bottle that needed to be added.

Either road you go down, it's all good.
Old 10-13-2012, 12:51 PM
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Originally Posted by drumnatural
U don't need the additive if u use synthetic gear oil
That's not exactly true. For example Mobil 1 does not have the additive, read the label of what your buying. I like Redline, it has the additive like RP but costs about $5 less per quart.

Last edited by Flip94ta; 10-13-2012 at 12:54 PM.
Old 10-14-2012, 12:17 PM
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I'm changing mine this weekend, installing ARB diff covers & using Redline synthetic in the rear dana 44 and regular 75-80 in the dana 30 front.
Old 07-24-2013, 06:17 AM
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Sometimes dealers suck... Had my 09 in for an oil change... I knew the diff service was coming up, but they wanted $139.00 for REAR ONLY...

Anyone want to tell me what they are doing for a "Rear Diff service" besides changing the oil???

Needless to say, I have four quarts of Royal Purple in my garage that will have new home this weekend...


Anything need to be looked at besides fluid?

2009 23k miles (yes, I don't drive her much)


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