Front diff throws oil - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 08-09-2010, 11:05 PM   #1
zaitcev's Avatar
Join Date: Jun 2010
Posts: 330
Front diff throws oil

I examined the jeep today and found front driver side brake lines dripping with a fluid. At first I thought it was brake fluid, but the brake fluid makes the fingers feel strange, kinda like after soap. This fluid did not. After some searching I found that it comes from the differential's breather. On my JK the breather hole is connected to a long rubber hose that goes along the left side of the engine compartment and ends under the top longitudal stiffener with a trick valve. I surmise this is done for fordability.

In short my front diff spews oil through its breather very high up.

What may be the reason for this?

Also, the differential housing gets pretty hot in driving (in normal 2WD). Is this ok? How hot can it get before I need to have it checked?

-- Pete

zaitcev is offline   Quote
Old 08-09-2010, 11:26 PM   #2
GroundHawg's Avatar
Join Date: Apr 2010
Location: northeast ohio
Posts: 2,274
heat is normal. don't worry about it.

have you recently filled your axles or gotten a fluid change? if you manage to overfill them they will overflow out the breathers.

um...they quiet? no whine or grinding or anything?

EDIT: check those hoses out too. make sure there's no crack or split or anything and that everything is nice and tight. nice seals, etc

GroundHawg is offline   Quote
Old 08-10-2010, 09:35 AM   #3
JIMBOX's Avatar
Join Date: Nov 2009
Posts: 9,914
Mine "dripped' oil for the first 6 months after "new" and when I checked the "LEVEL" fill plug, it would still spill out slowly !!

It's just an overfill from the jeep assembly, sometimes a little -sometimes a lot

Pull your fill plug and let it drain, till level with the bottom of the plug, do some wipe up and you should be OK !!

I've Never had any trouble with the rear diff. !!

Good luck

"ya gotta have class"
JIMBOX is offline   Quote
Old 08-10-2010, 10:35 AM   #4
zaitcev's Avatar
Join Date: Jun 2010
Posts: 330
Thanks, guys. I'll find the level plug and report (obviously not one on the bottom).
-- Pete
zaitcev is offline   Quote
Old 08-30-2010, 03:25 PM   #5
zaitcev's Avatar
Join Date: Jun 2010
Posts: 330
Here's a report, to round up the thread.

There was no more throwing and indeed the front was overfilled at the factory. So I think perhaps it was linked to crawling at extreme angles.

I replaced the fluid with Valvoline 80W-90. I did not use a synthetic because some folks complained that axle seals started leaking after a switch to synthetic. Anyway, the front diff was more or less ok, the rear had plenty of sludge. That's after only 3660 miles. There may be something going on with the rear diff, but front seems ok now.

Thanks for the suggestions,
-- Pete
zaitcev is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
'05 Wrangler X Front Differential Problem-I'm a NOOB SweetMelissa TJ Tech Forum 1 05-25-2010 10:15 PM
Who has a front receiver on their yj? Winch mounting.... EricRanger YJ General Discussion Forum 0 04-20-2010 04:06 PM
Jeep front end project ygohome Builders Corner 85 03-14-2010 06:49 PM
need help with rebuilding my front diff. zpacini YJ Tech Forum 8 04-14-2009 08:02 PM
fRONT PINION SEAL BARKDOG67 TJ Tech Forum 6 03-09-2009 01:20 AM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 07:19 AM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC