Rear Differential is on it's last legs - Mustang Evolution

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Old 09-21-2014, 03:25 PM   #1
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Rear Differential is on it's last legs

My 2003 gt has been dripping fluid for about a month, and it has been making a loud squeaking. I took it in to get the squeak looked at because I already put on all new breaks. The mechanic took a look at it and found that the teeth have been really wearing down and there was bits of metal floating in the fluid. He drained the fluid and replaced it but he said it is going to have to be replaced. I could really use some advice on a different differential. any info will be greatly appreciated
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Old 09-21-2014, 03:36 PM   #2
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4:10's
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Old 09-21-2014, 04:50 PM   #3
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When you say the teeth have been wearing, are you refering to the spider gears in the differential or the ring and pinion gear? Where is it leaking from? What do you use the car for? Mainly?
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Old 09-21-2014, 06:01 PM   #4
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When you say the teeth have been wearing, are you refering to the spider gears in the differential or the ring and pinion gear? Where is it leaking from? What do you use the car for? Mainly?

I am referring to the teeth of the spider gears, they are all ground up. It was leaking very slowly out of the bottom of the diff I guess, the big cover/ seal on the back (don't know what it's called). But my mechanic was able to fix the leak by replacing the seal. The car is mainly a daily driver, but it is driven hard occasionally. This is probably what killed the gears.
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Old 09-21-2014, 06:16 PM   #5
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It happens. I wore out one in a single season of autocross.
I think that the Ford Racing trac-lok (preferably with carbon clutches) would be a good replacement.
Make sure to do the axle bearings and seals while it's apart.
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Old 09-21-2014, 06:16 PM   #6
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The car is mainly a daily driver, but it is driven hard occasionally. This is probably what killed the gears.
No what probably chewed the gears up was the lack of lubrication that it needed. If you never topped the gear oil off as it was leaking, then the gears most likely started heating up due to no oil being thrown up to the upper portion of the gears or any at all. So by not taking care of this immediately is most likely going to cost you several hundreds of dollars in labor and new gear set.
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Old 09-21-2014, 06:32 PM   #7
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So by not taking care of this immediately is most likely going to cost you several hundreds of dollars in labor and new gear set.

Your right. The drips were so few I ignored it, but I should have taken it in then.
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Old 09-21-2014, 06:56 PM   #8
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It happens. I wore out one in a single season of autocross.

I think that the Ford Racing trac-lok (preferably with carbon clutches) would be a good replacement.

Make sure to do the axle bearings and seals while it's apart.

Thanks for the info, and do you think any gears that would fit in the stock one will fit in that one? I ask because I was planning on upgrading to 4.10s with the stock diff, and if I'm going to have to put in a new diff then might as well upgrade now
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Old 09-21-2014, 06:58 PM   #9
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Thanks for the info, and do you think any gears that would fit in the stock one will fit in that one? I ask because I was planning on upgrading to 4.10s with the stock diff, and if I'm going to have to put in a new diff then might as well upgrade now
Yep. Any gears will bolt right up!
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Old 09-21-2014, 09:18 PM   #10
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happy ending haha now your getting 4 10's!
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Old 09-25-2014, 11:41 AM   #11
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What is the lifetime of 4.10 gears? I've herd 1 year, I've herd 6 months from some as well but none of thoes sources are too reliable
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Old 09-25-2014, 12:04 PM   #12
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What is the lifetime of 4.10 gears? I've herd 1 year, I've herd 6 months from some as well but none of thoes sources are too reliable
Lol.
No, your sources are NOT too reliable!

4.10's or 3.73's are just like any other gear. Barring abuse or a mechanical defect, ring and pinion gears typically last the lifetime of the vehicle.
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Old 09-25-2014, 02:43 PM   #13
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What is the lifetime of 4.10 gears? I've herd 1 year, I've herd 6 months from some as well but none of thoes sources are too reliable
I am sorry but that made me laugh.


The 4.10's will probaby last longer than you have the car. Unless you do the innstall and you have never tackled a gear install. Not a job for the want to learn ppl. Leave it to the pro's. If your car is a automatic trans, then I would go with 4.10's, if it is a manual trans, then I would go with 3.73's.
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Old 09-25-2014, 03:44 PM   #14
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your car is a automatic trans, then I would go with 4.10's, if it is a manual trans, then I would go with 3.73's.

Why do you say that?
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Old 09-25-2014, 03:54 PM   #15
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Why do you say that?

Take a look at the gear ratios your transmission has and you will understand.


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Old 09-27-2014, 06:44 PM   #16
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Mines been dripping ever so slightly for a few weeks. So I torqued down the cover and the dripping stopped. However, I wanted to top of the fluid but cannot get the plug out at all. I'm to blame because I put it in when I changed the fluid a few years ago. It's rusted in there real good. PB Blaster had no effect.

I'm probably going to spring for the Steeda cover with the fill/drain plugs.
Easier than messing with the factory plug.

I have 2 bottles of Royal Purple, friction modifier already in it.
Is that enough?
I used Mobil One Synthetic last time but don't remember how much I put in to reach the hole.

tia!
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Old 09-27-2014, 07:36 PM   #17
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However, I wanted to top of the fluid but cannot get the plug out at all.

I had that problem on my Bronco and I took and applied heat to the plug and it came off finally. I too also used PB and to no avail.
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