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Overfilled diff? #5166770 07/20/19 10:02 PM
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HoosierJeeper Offline OP
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Did the diffs on my Liberty, filled the front till it ran out the fill plug and let it drain out of the fill, so the level is probably about even with the bottom of the fill plug. I was checking the manual today for a light bulb part # and noticed for the diffs it said spec is 1/2" below the fill hole. Should I suck a little out or is it okay to leave as is? Don't want to blow any seals out.

Thanks!


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Overfilled diff? [Re: HoosierJeeper] #5166773 07/20/19 10:08 PM
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gathermewool Offline
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At what temperature?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Magnatec 5W-20 + FU filter (47,300 miles)
Re: Overfilled diff? [Re: HoosierJeeper] #5166774 07/20/19 10:10 PM
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HoosierJeeper Offline OP
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I'm at below the fill plug cold, assuming the manual is a cold spec too.


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Overfilled diff? [Re: HoosierJeeper] #5166776 07/20/19 10:14 PM
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gathermewool Offline
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Your manual doesn't spec cold or hot?


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Magnatec 5W-20 + FU filter (47,300 miles)
Re: Overfilled diff? [Re: HoosierJeeper] #5166780 07/20/19 10:17 PM
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HoosierJeeper Offline OP
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Nope!


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Overfilled diff? [Re: HoosierJeeper] #5166784 07/20/19 10:21 PM
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Dyusik Offline
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There is a breather on the diff. I'm overfilled on the Jeep, but have no idea by how much because my pinion angle is way off. No issues, additional drag is not a concern on that rig.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 111K Frankenbrew, WIX 57173 (4 sale)
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Re: Overfilled diff? [Re: HoosierJeeper] #5166794 07/20/19 10:26 PM
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zeng Offline
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Leave it alone ......
for there isn't any (engine) crank to 'hit' the gear oil.
The gears and bearings will thank you for that.
The proof of the pudding is in the eating ....., by checking and ascertaining it's cool operating temperature.

Re: Overfilled diff? [Re: HoosierJeeper] #5166807 07/20/19 10:44 PM
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01rangerxl Offline
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I don't do the x amount below plug thing...fill it until it drips out.


2002 Ford Ranger XLT | 3.0 V6 Auto 2WD | 231K miles
1994 Ford Ranger STX | 4.0 V6 Manual 4X4 | 201K miles
1994 Ford Explorer XLT | 4.0 V6 Auto 4X4 | 250K miles
Re: Overfilled diff? [Re: HoosierJeeper] #5166853 07/21/19 12:31 AM
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Reddy45 Offline
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Did you perform this service on a slightly angled driveway? If so, it's possible you got it exactly right anyway.

Re: Overfilled diff? [Re: HoosierJeeper] #5166883 07/21/19 02:53 AM
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Char Baby Offline
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Most or all of the diffs that I have serviced called the unit full when the gear oil drizzled out of the fill hole.
However, they also stated that if you can feel/get oil on your finger(when inserting in the hole) than that's good enough.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic 1.8 LX
Re: Overfilled diff? [Re: HoosierJeeper] #5166898 07/21/19 04:58 AM
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demarpaint Offline
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If it is level with the lowest part of the threads of the fill hole it is fine. In fact that is how I was taught to fill them in school. It can be there or up to a 1/4" below with no worries.


God Bless Our Troops

Re: Overfilled diff? [Re: HoosierJeeper] #5166918 07/21/19 06:19 AM
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tblt44 Offline
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I'm anal about that stuff, I would remove some.
Does it really matter I don't know.
I'm sure it's cold level not hot level.
My Chevy 10 bolt rear ends have that same call out.
Why in the world would they not place a drain plug in a location so you could fill to top of the hole.
It's hard to get it 1/2 to 5/8 below the fill hole on mine.
I use a bent pappaer clip to measure mine.


2003 Avalanche Z71 5.3
2006 Tahoe 5.3
1989 Yamaha moto 4 250
2004 Key Largo w/70 Yamaha 2 stroke
Re: Overfilled diff? [Re: 01rangerxl] #5166944 07/21/19 07:37 AM
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4WD Online Confused
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Originally Posted by 01rangerxl
I don't do the x amount below plug thing...fill it until it drips out.


Done this way for years … front and rear on two sets of ramps to be level …

Re: Overfilled diff? [Re: HoosierJeeper] #5166992 07/21/19 08:24 AM
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Sam_Julier Offline
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I fill the diffs until it flows out on the Volvo 240 Dana 30 axles. This is what the Bentley 240 manual and my mechanic suggest. There’s never been an issue.

Last edited by Sam_Julier; 07/21/19 08:27 AM.

2013 Toyota Avalon Hybrid PPHM 0W20, 70k
1993 Volvo 245 T5 10W30, 157k
1993 Volvo 244 T5 10W30, 169k

Re: Overfilled diff? [Re: tblt44] #5166997 07/21/19 08:28 AM
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philipp10 Offline
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Originally Posted by tblt44
I'm anal about that stuff, I would remove some.
Does it really matter I don't know.
I'm sure it's cold level not hot level.
My Chevy 10 bolt rear ends have that same call out.
Why in the world would they not place a drain plug in a location so you could fill to top of the hole.
It's hard to get it 1/2 to 5/8 below the fill hole on mine.
I use a bent pappaer clip to measure mine.

get therapy....lol

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