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Need some advice, plastic inside diff

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Old Nov 3, 2022 | 07:48 PM
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Default Need some advice, plastic inside diff

Hey guys,

Need a bit of advice. I finally got around to changing my differential oil tonight, but my pump wasn’t working, so I had to use a syringe for removing and adding fluid. Both the pump and the syringe have a little plastic piece on the end, the one on the pump stays in place, which I thought was the case with the syringe. However, while filling the differential with oil, the little plastic tip came off inside the differential. I tried flushing it out with oil among other things but it’s still in there. What’s my best way to get it out?

My research tells me removing the rear diff cover does no good. Anyone had any luck flushing something like this out with oil?

Last edited by DW600RR; Nov 3, 2022 at 09:58 PM.
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Old Nov 4, 2022 | 12:22 AM
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Why did you use a syringe to remove fluid? Use a 10 mm hex and remove the bottom drain plug to drain the rear drive. Maybe the plastic piece will come out the drain hole. If not, flushing with fluid may wash it to the drain hole.
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Old Nov 4, 2022 | 01:22 AM
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I did drain it that way. The pump didn’t work so I was using the giant syringe to put the new fluid in. I was saying the syringe can be used for both removing and adding.
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Old Nov 4, 2022 | 08:29 AM
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This is the syringe I used. That little black connector is what is in the diff. My pump has something that looks almost just like that that functions to hold the tube in place at the opening of wherever you’re putting the oil and it does not come off the tube. I thought the connector was the same thing.


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Old Nov 4, 2022 | 09:26 AM
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This sucks, sorry this happened.
This could be anywhere in there. Drivers side cover removal, passenger side cover removal, a lot of work to find this piece.
I know I would be a bit concerned leaving it in there.
Good luck with this
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Old Nov 4, 2022 | 09:30 AM
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Does anyone know if it’s even possible to flush it out? The car is still on the lift, my thought was to put the old oil back in, spin the tires a few times, then drain and repeat until maybe it comes out.
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Old Nov 4, 2022 | 09:48 AM
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Drain the diff and try using a shop vac on the fill hole?
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Old Nov 4, 2022 | 05:10 PM
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Gentlemen,

There are times, exceedingly rare, when men are able to accomplish feats beyond human comprehension. Man’s first steps on the moon, Brady’s 7th Super Bowl victory, are a few that come to mind. Today is such a momentous day. For today is the day I successfully fished this little rubber ******* out through the fill hole in my differential using a $60 Amazon borescope and one of those bendy claw retriever things. All is right with the world.




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Old Nov 4, 2022 | 05:16 PM
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That is awesome!
great work!
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Old Nov 4, 2022 | 07:39 PM
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Whatever happened to simply removing the diff cover? The only reason it exists is to service-And clean-the inside of the pumpkin. If you want to save the fresh lube, clean the drain plug area with compressed air and brake cleaner before draining into a clean container (clean 1 gallon milk jug). If worried about lube purity, use a paint strainer afterward, with a paper towel for extra filtering to filter the lube. If you couldnt save the gasket, I'd simply apply some hi temp silicone. Best of luck, and congrats on getting it out........
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Old Nov 4, 2022 | 08:13 PM
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If that didn't work I think I'd have said F it and just drove the thing.
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Old Nov 4, 2022 | 09:13 PM
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Originally Posted by grinder11
Whatever happened to simply removing the diff cover? The only reason it exists is to service-And clean-the inside of the pumpkin. If you want to save the fresh lube, clean the drain plug area with compressed air and brake cleaner before draining into a clean container (clean 1 gallon milk jug). If worried about lube purity, use a paint strainer afterward, with a paper towel for extra filtering to filter the lube. If you couldnt save the gasket, I'd simply apply some hi temp silicone. Best of luck, and congrats on getting it out........
My first thought was to take the rear diff cover off, but I found someone on here that did the same thing I did and said you still couldn’t get to it with that cover off. I think he wound up getting to it through one of the side covers, but the steps involved in getting to a side cover was a bit more than I was ready to tackle.

The piece that fell in turned out to be rubber, not plastic. Would one have been worse than the other?

Last edited by DW600RR; Nov 4, 2022 at 09:27 PM.
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Old Nov 4, 2022 | 09:17 PM
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I also found people having done this same thing on the BMW, Tundra, Jeep, and vintage mustang forums.

Last edited by DW600RR; Nov 4, 2022 at 09:27 PM.
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Old Nov 7, 2022 | 09:45 PM
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I made a contraption for draining and filling diffs that works pretty good, especially if one cannot get a jug in a position to fill it. It consists of a vacuum pump for doing AC work from Harbor Freight, a 2 qt mason jar with 2 barbs on top, one of the barbs has a hose internally that goes to the bottom of the jar. Also hoses attached to the external barbs. Applying a vacuum to the barb without the internal hose with the other hose in the diff fill hole will pull the oil out and into the jar. It is easy to move the vacuum hose around in the diff to get all the oil out, I came up with this method draining my Jeep due to a trashed drain plug. Putting fluid back in is just as easy, fill the jar with the lube of choice and apply air pressure to the barb with no internal hose, it will force the lube up the other barbs internal hose and into the diff. Here is the jar I use.

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