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Old 02-16-2012, 05:37 PM   #1
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Rear diff change

On my JKU's D44 I drained and filled my diff with new gear oil as it was that time. Didnt have the time to actually take the diff off and give it a good clean cause I didn't have sealant and I was lazy. Anyways my buddy has a wrangler and swears by the royal purple so I got some 75w 140 (that's what my friend told me to get)) anyways it was a breeze but after I got to thinking is that actually the right oil to use? I did a bit of research and apparently it's 75w 90 gear oil? And it says something about a Mopar additive? What the hell is going on has my friend been using the wrong stuff. I'm debating weather or. Not to drain it again. BTW I lost my manual and the Internet can be misleading.

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Old 02-16-2012, 05:51 PM   #2
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The additive will b for your limited slip if equipped but the royal purple is good stuff and has it already n there. If the gear oil is thicker than factory recommended it won't hurt anything

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Old 02-16-2012, 05:53 PM   #3
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Thanks can I add the additive now? And it is a Limited slip diff. What would happen if I didn't add it?
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Old 02-16-2012, 06:05 PM   #4
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Thanks can I add the additive now? And it is a Limited slip diff. What would happen if I didn't add it?
You don't need any additives with RP synthetic.
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Old 02-16-2012, 06:10 PM   #5
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You don't need any additives with RP synthetic.
Gottcha thanks for the quickness this puts me at ease. But is 75w 140 the proper oil to use or is it 75w 90? Just for future. And how often should I actually take the cover off and clean the inside with cleaner then fill?
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Old 02-16-2012, 06:15 PM   #6
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75w 140 is what is recommended for towing. There is no harm in you having used it. Removing the covers let's you completely drain the oil. There's no need to clean anything.
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Old 02-16-2012, 06:15 PM   #7
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Gottcha thanks for the quickness this puts me at ease. But is 75w 140 the proper oil to use or is it 75w 90? Just for future. And how often should I actually take the cover off and clean the inside with cleaner then fill?
75w140 is fine. You should service your diff at least once a year or after any type of water crossing that is higher than you hubs.

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Old 02-16-2012, 06:37 PM   #8
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Thanks can I add the additive now? And it is a Limited slip diff. What would happen if I didn't add it?
The clutch pack won't slip enough and your tires will chirp going around turns.
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Old 02-16-2012, 06:52 PM   #9
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75w140 is fine. You should service your diff at least once a year or after any type of water crossing that is higher than you hubs.

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Once a year??? Really??? I can understand if your rear is submersed but its gear oil not ATF. It can take a lot of heat and does not breakdown easily at all
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Old 02-16-2012, 07:19 PM   #10
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Once a year??? Really??? I can understand if your rear is submersed but its gear oil not ATF. It can take a lot of heat and does not breakdown easily at all
The severe service recommendation is 15k.
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Old 02-16-2012, 07:20 PM   #11
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The clutch pack won't slip enough and your tires will chirp going around turns.
He used synthetic. Ls additive isn't required.
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Old 02-16-2012, 07:28 PM   #12
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The severe service recommendation is 15k.
Yep, pretty common to go 15K in a year for many people. I would also argue that most enthusiasts go beyond the severe duty in their driving, so I think it is better to be safe than sorry on this one. No one has ever been accused of changing fluid too often.

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Old 02-16-2012, 08:36 PM   #13
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Yep, pretty common to go 15K in a year for many people. I would also argue that most enthusiasts go beyond the severe duty in their driving, so I think it is better to be safe than sorry on this one. No one has ever been accused of changing fluid too often.

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I agree with you. I drive about 20 to 24k per year so I was thinking even more often than 1 year.
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Old 02-16-2012, 09:38 PM   #14
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I am on a quarterly schedule for chaning my diff oil. I wheel in the Pine Barrens of NJ regularly and there is plenty of water coming over the axle. It is also recommended to raise the diff breathers if you are going to play in water on a regular basis. A snorkel isn't a bad idea either, but that changes the subject of the thread.
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Old 02-16-2012, 11:13 PM   #15
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I am on a quarterly schedule for chaning my diff oil. I wheel in the Pine Barrens of NJ regularly and there is plenty of water coming over the axle. It is also recommended to raise the diff breathers if you are going to play in water on a regular basis. A snorkel isn't a bad idea either, but that changes the subject of the thread.
Good info ryan where exactly are the breather tubes located on the JK? Does anyone have pictures of their locations
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Old 02-16-2012, 11:47 PM   #16
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Quote:
Originally Posted by JkJared

Good info ryan where exactly are the breather tubes located on the JK? Does anyone have pictures of their locations
Rears run up the shock tower somewhere to the top of wheelwell.

Fronts same and run up near the grill I believe.

TC/tranny mid engine bay.
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Old 02-17-2012, 12:03 AM   #17
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Rears run up the shock tower somewhere to the top of wheelwell.

Fronts same and run up near the grill I believe.

TC/tranny mid engine bay.
Yup. Front diff vent runs up drivers side of inner wheel housing alongside shock.

TC/tranny vent is on back of engine above bellhousing.

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