Rear End Replacement - Mustang Evolution

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Old 01-24-2015, 04:41 PM   #1
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Rear End Replacement

Hey guys, so I need some help.
Okay, so I bought my car knowing that there was something wrong with the rear end. At highway speeds, the rear would make a whirring noise when you would let on the gas at all, but would stop when you let off. Not knowing a whole lot about the rear end of a car, I figured that that meant that I needed a new wheel bearing on one of the rear wheels. Upon trying to take the differential apart to get the bearings out, I learned that
1. The differential was very low on fluid.
2. The pin that held the spider gears in place was broken and stuck.
So, I figured that THAT must have been what was making the noise, and replaced the spider gears AS WELL AS the wheel bearings and seals on both sides. not to mention filling the diff with new fluid.
Well, the rear is still making that noise. Fantastic.
So after doing my homework, I've come to the conclusion that either the ring or pinion gears are bad. So I have a couple of questions now.
1. Is it my ring/pinion gear that is making the whirring?
2. What else could it be?
3. Would I be better off just replacing the entire rear end?
4. What would be involved in doing a rear end swap?
5. How much should I expect to spend on a rear end?
6. Any tips/tricks/things to keep in mind while doing a rear end swap?
If anyone has any knowledge on the topic/any of those questions, please feel free to help a brother out. Oh, and the car is a 1999 Mustang V6. Thanks guys!
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Old 01-24-2015, 05:16 PM   #2
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well if I was in your position I'd personally get a new rear end. An 8.8 from a gt, they're better and I've read that they are a direct fit. And I'm pretty sure they have posi trac so no more one wheel peels like the 7.5 on the V6's. If u don't have a alot to spend check your local pull a part, for a cheap one. Any 8.8 off a 94-04 will fit.
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Old 01-24-2015, 05:35 PM   #3
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I'm having this same problem. Does anyone kno of a year from a 7.5 ranger with 3.73 and posi that would fit. I figure it's all put together and it fits the same it's everything you could want with a v6. Also I haven't heard of the 8.8 coming with 3.73's, has anyone else?
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