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Old 07-20-2010, 09:42 AM   #1
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differential fluids

ok need some help...

2003 jeep wrangler rubicon...about 1 month ago i had the front and rear diff oil changed out and they put 80W-90 in the front and 75W-140 in the rear. I believe the 03 rubicons came with trac-lok so Im pretty sure they put in the slip additive because I dont have any issues...safe for the fact they over-filled each diff by almost a full qt. I only know this because they did the same thing to my tranny and t-case. Needless to say i will be doing the work myself from now on.

After draining them down to the proper levels...it got me thinking...why would they put 75W-140 in my rear??? Then it hit me...the aftermarket bumper has a hitch receiver. I dont tow anything except my hitch hauler with two cans if trash to the dump... could I go back to 80W-90 and add the tru-lok additive myself.(just to be sure those morons are the snappy lube didnt !@## -up my diff)

pending on what you guys (jerry) thinks, I'm going to get some amsoil 80W-90 and some tru-lok at napa today.

PS- this only got me started because I noticed some auto-transmission fluid blown back on my gas tank. I think it was coming from the breathers on my transfer-case. I bet i drained about 1 1/2 qts out of it where they over-filled. I hope i didnt blow a seal.

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Old 07-20-2010, 09:45 AM   #2
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How can you overfill them by a quart unless you have aftermarket diff cover? you fill it to the fill hole and it will start draining out, same for the tranny and t-case. Seems like it would be impossible to overfill it unless it wasn't parked on level ground, it would be pouring out the fill holes as fast as you were pumping it in. How do you know they overfilled?

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Old 07-20-2010, 10:04 AM   #3
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well they over-filled em. I opened the fill holes to check the fluids and it came gushing out. I even got up early this morning (letting the car sit overnight so all the fluids would be cold) and re-checked em. They were right on the level, only a tiny bit came out as expected. And yes I was on level ground.
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Old 07-20-2010, 10:09 AM   #4
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only thing i can think of is they pumped it in fast and had the plugs at the ready... I know it sounds crazy but i kid you not...the fluids ran out of there like a stuck pig... Maybe not a qt but it sure felt like it...
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Old 07-20-2010, 10:10 AM   #5
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The Rubicon doesn't come with a Tracloc which is a clutch-based LSD offered in non-Rubicons so it does not need the usual friction modifier additive that the Tracloc requires. The Rubicon's rear LSD is gear based so it needs no additive, pretty much any GL-5 gear lube can be used in both Rubicon axles.
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Old 07-20-2010, 10:15 AM   #6
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Quote:
Originally Posted by Jerry Bransford View Post
The Rubicon doesn't come with a Tracloc which is a clutch-based LSD offered in non-Rubicons so it does not need the usual friction modifier additive that the Tracloc requires. The Rubicon's rear LSD is gear based so it needs no additive, pretty much any GL-5 gear lube can be used in both Rubicon axles.


Jerry you are my hero and i really mean that...not being a prick...I wasnt for sure but I was hoping my 03 rubi didnt have trac-lok. But from what i've been reading, it does have a gear driven LSD correct? And I dont need any additives for it??
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Old 07-20-2010, 10:16 AM   #7
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got it!
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Old 07-20-2010, 10:17 AM   #8
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off the top of ur head..do you know how much oil the rear and front diffs are suppose to hold?
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Old 07-20-2010, 10:29 AM   #9
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IIRC dana 30 holds 1.25 quarts and 35 hold 1.75 quarts. Fill it until it comes out of the hole then plug it.
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Old 07-20-2010, 10:31 AM   #10
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The Dana 44 axles hold just under two quarts each so you need four quarts total.
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Old 07-20-2010, 10:35 AM   #11
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thanks fellas, am i correct on these numbers:

NP241 transfercase - 2 qts of ATF+4
NV3550 tranny - 3 qts of mopar manual transmission fluid or equvalant
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Old 07-20-2010, 10:36 AM   #12
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Quote:
Originally Posted by Jerry Bransford View Post
The Dana 44 axles hold just under two quarts each so you need four quarts total.
so thats for front and rear right? 4 qts total
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Old 07-20-2010, 10:38 AM   #13
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Sorry forgot you had a 44 I was thinking 30/35
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Old 07-20-2010, 10:42 AM   #14
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hey adkjoe..you got me thinkin man..how could they overfill....but i swear that fluids poured out of em really bad....and like i said i got up this morning and check all 4 plugs again...lol i even got a level and checked that too... everything SEEMS fine, I may stop in at a trusty mechanic and have him check the fluids just to be safe.
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Old 07-20-2010, 10:50 AM   #15
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I wouldn't worry so much about your fluids, as long as there up to the fill holes your go to go.

As far as them overfilling, no idea. The only way I can think of to overfill it is to one be an idiot and two trying to fill it while parked on an incline or like you said pump it in ridiculously fast and and have the plug ready to be put in.
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Old 07-20-2010, 05:29 PM   #16
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You are pretty harsh on your lube guys. I doubt they could get an extra qt of gear oil in your D44s unless they stood it on it's nose and filled the rear diff. I always slightly over fill my fluids. 1/2 qt extra of oil, diffs as fast as I can then plug, etc. I run HD diff fluid too, 85-140 in both. I have about 90K miles with 0 issues, and probably 50K of off road.
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Old 07-21-2010, 08:06 AM   #17
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Quote:
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You are pretty harsh on your lube guys. I doubt they could get an extra qt of gear oil in your D44s unless they stood it on it's nose and filled the rear diff. I always slightly over fill my fluids. 1/2 qt extra of oil, diffs as fast as I can then plug, etc. I run HD diff fluid too, 85-140 in both. I have about 90K miles with 0 issues, and probably 50K of off road.
well maybe not a qt but they did over fill it...I dont like it flooding my skid plate when i check the fluid in my transfer case...a little bit sure but not like it did. as for the diffs...i doubt i got 1/2 qt out of them....but i did get some. my main concern was the amount of fluid in my transfer case and tranny. I was afraid i blew a seal on the tc due to the amount of the fluid in there. I drained it to the proper levels and now im not gettin any blow out around my rear driveshaft like before. The underbelly was glazed with ATF+4.... Either way im good to go now...all the fluids have been drained to proper levels
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Old 07-21-2010, 07:17 PM   #18
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Here's the numbers according to the FSM:

Front Dana 30= 2.5 pts Rear Dana 35= 3.5 pts

Front Dana 44= 4.0 pts Rear Dana 44= 4.0 pts

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