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Old 11-20-2013, 09:12 AM   #1
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Changing gear Oil

Just finished doing rear (working on front). filled till it started oozing out the fill hole. used 80w90 starting to change it same time i change my engine oil.

this is way easyer than the engine oil change. now im NOT taking the cover off, because the drain plug has no chuncks, just a small amount of shavings, fine, like sand, not much. so its still good. im just at 20k miles on my 2012 atm.

in april i will be putting 5.13 gears in front and back and eaton lockers. should i use synthetic with lockers, or does it not matter since im changing it often?

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Old 11-20-2013, 09:35 AM   #2
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There is really no need to change it that often. If you have LSD, make sure you are adding the modifier or synthetic.

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Old 11-20-2013, 09:55 AM   #3
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Originally Posted by daggo66 View Post
There is really no need to change it that often. If you have LSD, make sure you are adding the modifier or synthetic.
No LSD. and. i like doing it, often, i dont do much so it makes me feel like im helping. lol
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Old 11-20-2013, 12:11 PM   #4
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Quote:
Originally Posted by kcasey View Post
No LSD. and. i like doing it, often, i dont do much so it makes me feel like im helping. lol
LOL. Changed mine twice now- wanted to post a "look I did something all by myself" thread. After 15 years of maintaining and modifying all of our vehicles my husband wasn't too impressed.I went back to conventional on the last one. Not worth the extra $$.
IMO with new gears I would change fluid after the first 500 and I'd change it again sooner than the recommended. And pull the cover. Just my two cents- inspecting the gears after they've had a chance to wear is never a bad idea. I noticed I had a loose bolt and lost some fluid. Decided to do a full fluid change since I broke the seal- discovered I have an odd wear pattern on my ring gear. Cheap and easy way to check an expensive mod.
Good info here:
Dana 30 fluid capacity?
Ie:
Lubrication
The TrueTrac differential is designed to operate in those lubricants recommended by the vehicle/axle
manufacturer for conventional differentials.

Thats from the Eaton Truetrac owners manual. From what I've read, if you use synthetic etc, will get some 'chatter'
I have them installed front and rear for about a year and a half, changed the oil twice with regular diff oil, no problems.
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Old 11-20-2013, 09:12 PM   #5
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Quote:
Originally Posted by JeepHerz View Post
LOL. Changed mine twice now- wanted to post a "look I did something all by myself" thread. After 15 years of maintaining and modifying all of our vehicles my husband wasn't too impressed.I went back to conventional on the last one. Not worth the extra $$.
IMO with new gears I would change fluid after the first 500 and I'd change it again sooner than the recommended. And pull the cover. Just my two cents- inspecting the gears after they've had a chance to wear is never a bad idea. I noticed I had a loose bolt and lost some fluid. Decided to do a full fluid change since I broke the seal- discovered I have an odd wear pattern on my ring gear. Cheap and easy way to check an expensive mod.
great advice!
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Old 11-21-2013, 04:36 PM   #6
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Did mines on my new to me 08 jkur for the first time at 71k .. Took off the covers and gave it a good cleaning and inspection as i didnt know what they PO had done to it..
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Old 11-21-2013, 05:06 PM   #7
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Did my first gear oil change last week. Used the time to install new diff covers.
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Old 11-21-2013, 05:08 PM   #8
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Quote:
Originally Posted by kcasey View Post
Just finished doing rear (working on front). filled till it started oozing out the fill hole. used 80w90 starting to change it same time i change my engine oil.

this is way easyer than the engine oil change. now im NOT taking the cover off, because the drain plug has no chuncks, just a small amount of shavings, fine, like sand, not much. so its still good. im just at 20k miles on my 2012 atm.

in april i will be putting 5.13 gears in front and back and eaton lockers. should i use synthetic with lockers, or does it not matter since im changing it often?
From what I read it depends on the locker. ARB for instance recommends you do NOT use a fluid with friction modifier because it eats the seals. Might want to email the manufacturer of your locker and ask them what they think.

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