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Changing oil in differential

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Old 09-03-2009, 10:18 PM   #1
birdnstang
 
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Default Changing oil in differential

Our Mustang is presently at the shop. We want to change the oil in the rear end. We know on Chevies and Pontiacs that there is a cover plates on the differentials. These we know are easy to drain the oil out. We were told by the shop that the Fords are different. We haven't actually seen the rear end. They are talking about pulling the axles and the pumpkin has to be taken the apart. Does this sound right to you?
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Old 09-03-2009, 11:01 PM   #2
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Originally Posted by birdnstang View Post
Our Mustang is presently at the shop. We want to change the oil in the rear end. We know on Chevies and Pontiacs that there is a cover plates on the differentials. These we know are easy to drain the oil out. We were told by the shop that the Fords are different. We haven't actually seen the rear end. They are talking about pulling the axles and the pumpkin has to be taken the apart. Does this sound right to you?
No, it sounds stupid. Stick a siphon or draw pump tube in there and suck out the old oil. Anyone, even Jiffy Lube, can do this. They are WAY over-doing it.
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Old 09-03-2009, 11:55 PM   #3
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No, it sounds stupid. Stick a siphon or draw pump tube in there and suck out the old oil. Anyone, even Jiffy Lube, can do this. They are WAY over-doing it.
I wouldn't exactly say they are WAY over-doing it. What they are saying is what I would consider the PROPER way to do it but I HAVE done the siphon thing also. It's not as easy as it sounds with heavy gear oil, though.
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Old 09-04-2009, 02:03 AM   #4
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I wouldn't exactly say they are WAY over-doing it. What they are saying is what I would consider the PROPER way to do it but I HAVE done the siphon thing also. It's not as easy as it sounds with heavy gear oil, though.
We drive the car before siphoning the gear oil out. Driving heats up and thins it temporarily. With the car not running though I suppose a heat gun could help too.
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Old 09-04-2009, 07:41 AM   #5
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The advantage to pulling the pumpkin is you can then add a drain plug to the bottom. If you pull the pumpkin the axles have to be removed first.
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Old 09-04-2009, 09:52 AM   #6
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The disadvantage to removing the diff is you have to replace the seals and gaskets. I don't see the big attraction for having a drain. Ten years from now, if you even still own the car, you might be thinking about changing it again. Lessee, stick tube in diff, draw out oil, pump in new oil, 15 minutes, tops. Or you can pull the axles and diff, clean out all the oil to prevent fire, drill drain hole, weld on drain bung, replace wheel seals, coupla hours. So now having the drain makes changing the diff oil a minute quicker, since you don't have to insert the drain hose. If you change the oil every year (ridiculous, I know) in only 50 or 60 years you might break even on the work it took to install the drain.
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Old 09-05-2009, 01:03 AM   #7
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The disadvantage to removing the diff is you have to replace the seals and gaskets. I don't see the big attraction for having a drain. Ten years from now, if you even still own the car, you might be thinking about changing it again. Lessee, stick tube in diff, draw out oil, pump in new oil, 15 minutes, tops. Or you can pull the axles and diff, clean out all the oil to prevent fire, drill drain hole, weld on drain bung, replace wheel seals, coupla hours. So now having the drain makes changing the diff oil a minute quicker, since you don't have to insert the drain hose. If you change the oil every year (ridiculous, I know) in only 50 or 60 years you might break even on the work it took to install the drain.

That's what I've always done and it works well.
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Old 09-07-2009, 08:07 PM   #8
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Thanks! We're going to pump it out.
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Old 09-07-2009, 08:59 PM   #9
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I put a drain plug in mine. And I change my fluid at least 2x a year. A lot of it depends on how hard you drive and how hot the climate is. I beat my car a lot in a hot climate, so the oil gets flogged.
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Old 09-07-2009, 09:40 PM   #10
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Depends on how hard you drive it. If you're on it hard then adding the drain is worth the time and effort because you should be chaecking the rear more often. If you're not driving it hard then I'd say no.
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Old 09-08-2009, 02:51 AM   #11
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If they are a reputable shop and not over charging you for the work it would be a good opprotunity to do a visual inspection on the gears and bearings. These cars are pretty old and one of the things thats that get over looked while doing maintenance is the rear end. If you don't care about that stuff just suck it out and put new in.
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Old 09-09-2009, 11:19 AM   #12
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Originally Posted by 2+2GT View Post
The disadvantage to removing the diff is you have to replace the seals and gaskets. I don't see the big attraction for having a drain. Ten years from now, if you even still own the car, you might be thinking about changing it again. Lessee, stick tube in diff, draw out oil, pump in new oil, 15 minutes, tops. Or you can pull the axles and diff, clean out all the oil to prevent fire, drill drain hole, weld on drain bung, replace wheel seals, coupla hours. So now having the drain makes changing the diff oil a minute quicker, since you don't have to insert the drain hose. If you change the oil every year (ridiculous, I know) in only 50 or 60 years you might break even on the work it took to install the drain.
It is much more than a minute difference. 10 seconds to pull the drain plug. Now you can walk away and do something else so this time does not count. Filling will take about 3 minutes so it takes 3 minutes and 10 seconds with a drain and 15 with a pump. Every time you save 11 minutes and 50 seconds. Going to pay back much faster than 50 years. The other side is I already own a welder and would have to go buy a vacuum pump if I wanted to suck the oil out.

What gaskets and seals are you talking about? I just built/rebuilt a 9" and I will not be using any gaskets or seals in places that would be damaged by pulling the pumpkin. RTV where the pumpkin attaches and the bearings I bought for the axles are sealed. All I have to do is put a little rtv around the outer edge when I install the axles. I put in a drain because their was never going to be a better opportunity to do so.

If I just wanted to change the oil in my 8" I have currently would I pull the pumpkin? Most likely, I would want to see what the gears looked like and get all the oil out. You have no idea how much oil you are getting out if you use a pump. I plan on changing my oil much more than once ever 10 years.
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Old 09-09-2009, 04:34 PM   #13
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RTV works, anaerobic sealer is good as well for flat metal-metal mating surfaces.
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Old 09-10-2009, 07:52 AM   #14
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thanks 67mustang302, I will try the anaerobic sealer when I finally get around to installing the axles in the rear.
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Old 09-10-2009, 11:45 AM   #15
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Anaerobic is what is used on TREMEC transmissions and most factory stuff(transmissions and diffs) these days. They've done away with gaskets. Just make sure the mating surfaces are both flat.
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Old 09-10-2009, 01:55 PM   #16
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I plan on changing my oil much more than once every 10 years.
Why? Is it a racing vehicle? Track or drag?
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Old 09-11-2009, 07:34 AM   #17
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Because i want to, going 10 years just doesn't seem right. No its not a racing vehicle but i do tend to drive it hard. I have way to much time and a fair amount of money tied up in it that I will do anything I can to prolong the life of it.
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Old 09-11-2009, 07:34 AM
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2007, 67, 9, change, differential, end, gear, lube, mustang, oil, pump, rear, siphon, suck, vintage

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