Another Differential Question

Gregorio · 06-22-2015, 08:50 PM

"Some" fine metal in the bottom of the pan during the first fill is somewhat normal. The gears need to seat together and any minor imperfections will wear away as they do. Once they have created their optimum mating surface, there should be no more metal in the pan under normal conditions.

Go ask this question on bobistheoilguy.com if you still are not sure about using gear oil in a gear box.

whitetaco02 · 06-22-2015, 09:07 PM

Quote:

Originally Posted by Gregorio

"Some" fine metal in the bottom of the pan during the first fill is somewhat normal. The gears need to seat together and any minor imperfections will wear away as they do. Once they have created their optimum mating surface, there should be no more metal in the pan under normal conditions.

Go ask this question on bobistheoilguy.com if you still are not sure about using gear oil in a gear box.

This wasn't the first fill though. It's only been two to three weeks since I did it the first time but the RTV didn't seal correctly so I redid it.

Gregorio · 06-22-2015, 10:16 PM

Then that is not so good news, IMO. Have you checked the bearings and shafts for excessive wear and end play? Are they loose? Are there score marks on the gear faces or are they polished? If the latter, you are probably OK. Anything else is more indicative of a problem.

whitetaco02 · 06-23-2015, 09:42 AM

Honestly everything looked great in there with no other problems whatsoever. I am wondering if I don't have a LSD and I used 30 weight oil and shouldn't have.

daven8844x · 06-23-2015, 09:52 AM

It appears to have been brought up a couple of times, but what I thought was a pan leak was a leak from the area where the motor meets the rear diff that was running down to the pan. To be sure, if it is not clean, wipe the area clean. Go out and drive. Come back and see if oil is coming from that area (which then runs down to the pan and drips from the bottom of the pan).

I have a 2008 PDS. This was my issue just last night. I replaced the o-ring where the input shaft goes into the differential with a $1 o-ring from Advanced Auto Parts, and that appears to have fixed the leak. Good luck.

whitetaco02 · 06-23-2015, 09:58 AM

I just jacked it up and turned one wheel and the other one went the other way so no LSD.

I spoke with a guy at Beast who was very helpful and said that the shavings were normal and could have washed down.

whitetaco02 · 06-23-2015, 10:01 AM

Quote:

Originally Posted by daven8844x

It appears to have been brought up a couple of times, but what I thought was a pan leak was a leak from the area where the motor meets the rear diff that was running down to the pan. To be sure, if it is not clean, wipe the area clean. Go out and drive. Come back and see if oil is coming from that area (which then runs down to the pan and drips from the bottom of the pan).

I have a 2008 PDS. This was my issue just last night. I replaced the o-ring where the input shaft goes into the differential with a $1 o-ring from Advanced Auto Parts, and that appears to have fixed the leak. Good luck.

I have looked over the entire area you are talking about and it is dry. When I filled the pan back up last time some ran out the back over the blue rtv and I don't think it was able to sure properly. The guy at Beast said he used the black rtv not blue. What is the difference?

whitetaco02 · 06-23-2015, 12:08 PM

I have some Mobil 1 synthetic gear oil in 75w-90 that I am going to pump in today. We will see how that works out. Thoughts?

06-22-2015, 08:50 PM	#11
Gregorio Gone Wild Join Date: Apr 2015 Location: NorCal Posts: 718	Re: Another Differential Question "Some" fine metal in the bottom of the pan during the first fill is somewhat normal. The gears need to seat together and any minor imperfections will wear away as they do. Once they have created their optimum mating surface, there should be no more metal in the pan under normal conditions. Go ask this question on bobistheoilguy.com if you still are not sure about using gear oil in a gear box.

06-22-2015, 10:16 PM	#13
Gregorio Gone Wild Join Date: Apr 2015 Location: NorCal Posts: 718	Re: Another Differential Question Then that is not so good news, IMO. Have you checked the bearings and shafts for excessive wear and end play? Are they loose? Are there score marks on the gear faces or are they polished? If the latter, you are probably OK. Anything else is more indicative of a problem.

06-23-2015, 09:42 AM	#14
whitetaco02 Not Yet Wild Join Date: Jun 2015 Posts: 10	Re: Another Differential Question Honestly everything looked great in there with no other problems whatsoever. I am wondering if I don't have a LSD and I used 30 weight oil and shouldn't have.
whitetaco02 Not Yet Wild Join Date: Jun 2015 Posts: 10

06-23-2015, 09:52 AM	#15
daven8844x Not Yet Wild Join Date: Dec 2012 Posts: 20	Re: Another Differential Question It appears to have been brought up a couple of times, but what I thought was a pan leak was a leak from the area where the motor meets the rear diff that was running down to the pan. To be sure, if it is not clean, wipe the area clean. Go out and drive. Come back and see if oil is coming from that area (which then runs down to the pan and drips from the bottom of the pan). I have a 2008 PDS. This was my issue just last night. I replaced the o-ring where the input shaft goes into the differential with a $1 o-ring from Advanced Auto Parts, and that appears to have fixed the leak. Good luck.
daven8844x Not Yet Wild Join Date: Dec 2012 Posts: 20

06-23-2015, 09:58 AM	#16
whitetaco02 Not Yet Wild Join Date: Jun 2015 Posts: 10	Re: Another Differential Question I just jacked it up and turned one wheel and the other one went the other way so no LSD. I spoke with a guy at Beast who was very helpful and said that the shavings were normal and could have washed down.
whitetaco02 Not Yet Wild Join Date: Jun 2015 Posts: 10

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06-23-2015, 12:08 PM	#18
whitetaco02 Not Yet Wild Join Date: Jun 2015 Posts: 10	Re: Another Differential Question I have some Mobil 1 synthetic gear oil in 75w-90 that I am going to pump in today. We will see how that works out. Thoughts?
whitetaco02 Not Yet Wild Join Date: Jun 2015 Posts: 10

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