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Old 01-13-2014, 08:26 PM
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Diff oil replacement

In the Jeep service costs thread in this section there have been recent posts regarding the replacement of diff oil and I think it is worthwhile to have its own thread…..
I don't mind paying a fair rate to have work done for me, but my local dealer employs incompetent people so I decided to do the job myself.
48,000k on the odometer, so the vehicle had more km on the oil than it should - but the dealer forgot to change the oil at the 40K service! About 30K has been towing our van, and in temps ranging from freezing up to 45 degrees.

Just what oil to use has been a significant component of the discussion on the other thread, and those that want to catch up on this could pop over to that thread and get up to speed.
Suffice to say that having followed the input from some dedicated forum members, and biting my lip, i decided to go with Redline 75W90 GL5+.

I couldn't get it locally so purchased it on line through Ebay from GL Lubricants.
WK2Jeeps says 1.1l for front, and 1.2l (non ELSD) for the rear, so I purchased 3x1qt bottles. Placed the order on Saturday afternoon, and the box was delivered Tuesday morning at 7.30am. Great service.

OK, jacked up the front (used a stand to stop me being squashed), and removed the front tray (full of little stones that would have been rattling around like fury). 2x13mm bolts at the rear removed to let the tray drop down, and 2 x 13mm bolts at the front that only have to be loosened to let the tray slide out. Easy access then to the front diff.

8mm Allen key for both plugs. Checked the top first to make sure I could get it undone, then drained into a little bucket. The oil looked dark, and had a strong smell, not really a burnt smell, but quite different to the new oil.
Only around 900ml drained out. This is around 200ml short of the 1.1l supposed fill quantity.

To get the new oil in I used a 2l hand pressure sprayer, with a piece of 6mm plastic tube stuck in the nozzle. Filled the sprayer with 1qt, pumped up the bottle and just quietly let the oil be pushed into the filler hole. Took a few minutes but totally under control and no drips on the floor or me.
I could only get 900ml in before oil ran out of the filler hole.
Closed everything up and moved to the rear.


Easy access here once the vehicle is jacked and on a stand. Again 8mm Allen key for both plugs. Rear oil was also dark and strong smelling.
Quantity difference this time of a fraction over 1l out and the same amount able to be put back in.

So with the 900ml for the front and around 1050ml for the rear, 2 qts will do the job on a non ELSD vehicle.

Total time including thinking and cleaning up was a bit over an hour. No oil spilled, and satisfaction from knowing it has nice clean oil front and back.

Having no idea what was the original oil fill spec, and seeing the old oil, I would say it was certainly in need of a change.

Just whether 75W140 GL5 would be a better choice for the expected duty is a moot point. It wasn't a major job and I'll look to do the change again in 30k time - I'll only need to buy 1qt this time.
John
Attached Images
File Type: jpg Front diff old and new.jpg (93.8 KB, 31 views)
File Type: jpg Filling front diff.jpg (52.3 KB, 30 views)
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  #2  
Old 01-13-2014, 08:42 PM
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Re: Diff oil replacement

Mines in at Southport Friday. The 40k service is quoted at $850 but this does not include transmission fluids that are a "check and replace if required" on the itinerary. With is in mind, I might also let the transmission oil replacement slip and complete a DIY in a few weeks. Good bit of info John. Cheers. (PS, Ive got a pump off ebay that I use to fill by Yammy outboard gear box. Only $18 so this might be useful in filling up the transmission).
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Old 01-13-2014, 11:15 PM
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Re: Diff oil replacement

Good Post John

The oil pumps are also available at Supercrap and possibly BCF. I used the pump for my boat gearbox also as that is a stern drive.
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Old 01-14-2014, 12:30 AM
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Re: Diff oil replacement

Swampy - was your oil dark and smelly too?

those in the peanut gallery need not put in their bit…...
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Old 01-14-2014, 02:09 AM
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Re: Diff oil replacement

John, it was probably 6 months ago, but yes, it did have a fairly strong smell. I think it was dark, but certainly not black. (I normally judge colour as it is pouring into the container). I do remember thinking that it could have gone a lot longer.
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Old 03-31-2016, 05:54 AM
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Re: Diff oil replacement

Gents.

Somewhere here people have discussed diff oil and additives. I have had the diff oil replace on my MY14 Laredo (optioned with Quadralift and ORA II). The previous posts that I can't find were talking about a friction modifier for the Electronic Limited Slip Diff which I have. Recently I have noticed a feeling of slipping in the rear diff. Very intermittent but noticeable on moderate to hard acceleration.

Any thoughts, ideas??

Regards

Adrian.
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Old 03-31-2016, 07:19 AM
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Re: Diff oil replacement

Quote:
Originally Posted by adriwood View Post
Gents.

Somewhere here people have discussed diff oil and additives. I have had the diff oil replace on my MY14 Laredo (optioned with Quadralift and ORA II). The previous posts that I can't find were talking about a friction modifier for the Electronic Limited Slip Diff which I have. Recently I have noticed a feeling of slipping in the rear diff. Very intermittent but noticeable on moderate to hard acceleration.

Any thoughts, ideas??

Regards

Adrian.


To address a couple of comments in this discussion.....


The smell of the gear oil. Yes, gear oil, especially used gear oil, has a weird smell....something like cat piss. That's normal.

With respect to the friction modifier for the limited slip units. If you don't have the proper proportion of the friction modifier in the rear end, the clutches will NOT slip as intended, and when you go around a corner, they will try to remain locked up, therefore causing the condition known as "chatter". It's normal for a LSD to slip a little, if it didn't, turning a corner would be difficult.
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Old 04-20-2016, 08:37 PM
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Re: Diff oil replacement

Thanks to John's write up above Diff oil replacement I did my diffs also. I bought 3 quarts of Mobil 1 LS 75W-90 from GL Lubricants. I have the 230mm ELSD in the rear so I need the "LS" oil but for convenience I put the same into the front diff as well. Access to the back diff was a snack but not so the front. The Mopar steel sump plate had to be removed. This was not so easy because I also have the Chief bash plate which covers the front edge of the Mopar plate. Then my oil drain plug removal tool is an 8mm hex key with a 1/2" drive. It was too long to get in to the inlet plug. Luckily I found an old 8mm hex key in a box in the garage that did the job but it meant I had to torque it by hand later. The oil from both diffs drained dark and smelly. The new oil I got in by attaching a length of 10mm clear plastic hose to the oil bottles and squeezing. By up-ending the bottle and sucking air back in after each squeeze, the bottle could be fully emptied. The tricky part was holding on to the hose to make sure it didn't pop off the bottle while squeezing with the other hand. Note to self: make sure the seal on the bottle is removed before squeezing . Both diffs together took about 2.4L (about two and a half quart bottles) which is about right. The front should take 1.1L and the rear 1.3L. The weird thing is that only a total of 1.8L came out of the diffs. Either they never properly filled them or quite a bit has burnt off.
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Old 04-20-2016, 09:45 PM
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Re: Diff oil replacement

To make life easier for next time, stop in at "Super Crap Auto" and pick up a hand operated oil pump. Pretty cheap and makes life easy for these tasks.


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Old 04-21-2016, 06:31 PM
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Re: Diff oil replacement

Interesting that you got 1.8l total from your 2 diffs, about what I got out when I did mine - but I was short on the published capacity by almost 200ml each diff on the refill, despite efforts to get the full amount in.
Maybe a completely dry fill from new takes a bit more, and when drained leaves an oil coating over everything that may account for the difference.
Anyway - nice warm and fuzzy for a worthwhile couple of hours and a significant saving over a dealer price plus the satisfaction from knowing it was done properly.
Nice that you finally got around to it Bob.
John
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Old 04-21-2016, 11:44 PM
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Re: Diff oil replacement

Quote:
Originally Posted by John47 View Post
Interesting that you got 1.8l total from your 2 diffs, about what I got out when I did mine - but I was short on the published capacity by almost 200ml each diff on the refill, despite efforts to get the full amount in.
Maybe a completely dry fill from new takes a bit more, and when drained leaves an oil coating over everything that may account for the difference.
Anyway - nice warm and fuzzy for a worthwhile couple of hours and a significant saving over a dealer price plus the satisfaction from knowing it was done properly.
Nice that you finally got around to it Bob.
John
To tell you the truth, I had a bit of spillage with the hose popping off a couple of times which may account for it.
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Old 04-21-2016, 11:48 PM
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Re: Diff oil replacement

Quote:
Originally Posted by Swampy View Post
To make life easier for next time, stop in at "Super Crap Auto" and pick up a hand operated oil pump. Pretty cheap and makes life easy for these tasks.


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I was at the point of doing just that but since the bottle came with a purpose shaped nozzle, I thought I'd give it the benefit of the doubt. Maybe next time.
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