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Old 03-27-2013, 06:10 PM   #1
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Grinding noise from rear

I have a rather noticeable noise coming from my rear wheels upon turning. Its only after the car has been running awhile, no noise when i first start it up. Its a scraping grinding noise that just sounds painful upon turning. They replaced my brakes rotors and calipers when i bought the car. Other than that i think it could be a bearing maybe. Anyone have similar problem before?
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Old 03-27-2013, 06:13 PM   #2
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Jack your rear up and spin the tires.
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Old 03-27-2013, 06:14 PM   #3
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Could be the differential since you have a gt which has traction lok which is where both of your wheels are driven and since your turning the inside wheel is moving slower then the outside wheel...
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Old 03-27-2013, 07:26 PM   #4
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My carrier bearing went bad making that noise
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Old 03-27-2013, 07:41 PM   #5
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I just done my differential in mine it was bad. Didn't make the noise when first driving. But after driving for a bit, when I would turn in, or back out on a turn it would make rubbing, or deep grinding sound. Jack it up like as stated above. When you go to spin the wheel, you will feel some excess play as you start to spin the wheel. That's what I done. But of course I took it to a shop to make sure before I started buying parts. It cost me $45.00 to make sure what it was. Will probably be a little more if you have them put it back together so you can drive it, because they will have to put new fluid back in it. I just let them keep mine.
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Old 03-27-2013, 07:52 PM   #6
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Eat more fiber.
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Old 03-27-2013, 07:54 PM   #7
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Eat more fiber.
Bahahahaha you had to go there...
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Old 03-27-2013, 08:42 PM   #8
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Just had mine rebuilt. Bad axle bearing. Wiped out the axle, so I upgraded to an Auburn posi and 31 spline axles. The clutches in the trac-loc wear out and all the friction material finds its way into the bearings. Not good. You need to change the oil regularly with a trac-loc. It's a common problem.
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Old 03-27-2013, 09:51 PM   #9
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Yikes. This all sounds expensive. I will be calling a mechanic tomorrow. I took it to a ford dealer and they said they found nothing wrong and the car looked great. Looks like ill be going to a dif place now.
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Old 03-27-2013, 10:05 PM   #10
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It can get kinda pricey. I recommend finding a shop that only works on rearends and manual transmissions. A gear specialist.
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Old 03-28-2013, 05:21 AM   #11
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I spent 509 for parts, 454 on labor, I did have more than just the differential replaced though.
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Old 03-28-2013, 08:23 AM   #12
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Well there goes my gear/tuner money!
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Old 03-28-2013, 08:57 AM   #13
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On another not why not just rebuild the whole rear end? New 31 spline axle, new LSD and new set of gears? Anything else i would need for the project?
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Old 03-28-2013, 09:09 AM   #14
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Good idea to go ahead and replace the axle bearings since your going to have the axles out but I think you will have to anyway to run the bigger 31 spline axles. You will need a axle bearing puller to get the job done. Rebuilding the rearend is a simple task, if you can change your own brakes you should have the mechanical inclination to do your own LSD, Gears, and axles. And there are many on here to give you tech support if you find that you need it along the way. If you go through with it make sure you pay attention to what parts you use, they are not all created equal. Some gear sets have to be installed differently and shimed properly as where others dont. Also make sure you pick a LSD that fits your power level. If you get a LSD designed for to high of a power level your engine wont be able to make the LSD lock up and have power go to both tires, you will end up with one wheel peel.

Also some people when fully building their 8.8 they cut up the 8.8 and add 9 inch axle housings on the ends to run an even bigger spline axle, but I wouldnt go there unless your trying to make your 8.8 hold up to literaly 1000hp.

Removal and installation is pretty straight forward with everything going back the way it came out. The only one tricky part that you might have trouble with if no one tells you is when you have your rear brakes off and you have the axles unpined from inside the differencial housing you will need to find and pull out your speed sensors in order to pull the axles. If you dont pull the speed sensor youll never get the axles out or you will break your speed sensor. It can be hard to find, chances are it will be covered in brake grime and grease but its there, it will be attached behind where your brake rotor mounts to the axle.
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Old 03-28-2013, 09:37 AM   #15
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So would it be better to rebuild everything with new axles, lsd and gears or just buy a lsd that is set up for 28 spline. Right now im looking at AM 4.10 gear w/ install kit, ford racing 31 spline lsd and alloy usa 31 spline axle with new bearings. Anything im missing?
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Old 03-28-2013, 09:54 AM   #16
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You will need new gear oil with friction modifier as well. Goign ahead and doing the new axles with new bears is a good idea, the axles are the weak point in the 8.8 rear end. The LSD is most certainly whats causing you problems and a new gear is a good performance mod. Picking what gear ratio depends on alot of things. I can help you with gear choice if you tell me what you use your car for and what current mods you have and what future mods you have planned as well as if your car is manual or automatic.
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Old 03-28-2013, 09:59 AM   #17
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Well thats about 1100 in parts alone! Sounds like a weekend project at least. And my car is a 01 stock gt, has flowmaster 40s on it but i dont think that accounts for anything. Its my DD right now, honestly have no idea what the future plans are, would like a SC but who wouldn't !
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Old 03-28-2013, 10:02 AM   #18
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How many miles are on your car? And is it manual or automatic?
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Old 03-28-2013, 10:20 AM   #19
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Anyhow. 4.10's will be too much unless your never going to use a power add and your car is a manual.
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Old 03-28-2013, 10:23 AM   #20
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Well thats about 1100 in parts alone! Sounds like a weekend project at least. And my car is a 01 stock gt, has flowmaster 40s on it but i dont think that accounts for anything. Its my DD right now, honestly have no idea what the future plans are, would like a SC but who wouldn't !
Do you drive mostly city or highway, if city then go 3.73 or 4.10, if highway I would go 3.73 max
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Old 03-28-2013, 10:46 AM   #21
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My car has 88k miles with manual tranny, is there any other way? I drive about 30 miles to work highway every 3rd day.
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Old 03-28-2013, 10:52 AM   #22
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Manual or auto plays its a role in gear choice. You always go one gear set higher for an automatic trans. An automatic car that doesnt see highway use with no power adder could go as high as 4.30 gears as where a set of 4.10s would be used on a manual. Also to look for performance improvement by switching gears you always have to bump up at least 2 gear ratio set when ever power adders are not present do notice a substantial gain. This means 3.55 gears will not give you a very noticable improvment on a non power adder car over stock 3.27/3.31 gears. The 3.55 set is only effective when your talking about a mustang has 3.08/2.73 gears from the factory or the addition of certain power adders.

You always have to consider no power adder vs. power adder and the power adder type matched with car weight class matched with tire and suspension type as well as driving type determines the most effective performance gear ratio. Everyone on here seems to say 4.10's are the best but that simply just isnt the case for every application.
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Old 03-28-2013, 11:01 AM   #23
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In your situation I would recommend the 4.10 gear set if you reach for the gears. Keep in mind though you will have to recalibrate your speedometer which usually means the purchase of a tuner as well. But really all you have to do to fix your current problem is replace the LSD if your short on cash. Gears, axles and tuner can wait for another day and after you replace your LCD you will already know what it takes to install gears and axles by the time your done. I would still recommend to go ahead and replace the axle bearings since you will have the axles out...

---------- Post added at 11:01 AM ---------- Previous post was at 10:57 AM ----------

If you decide to go ahead and replace the axle bearings and you should since you will have everything apart. Wait until you pull the axles to purchase the new bearing. If your axles are groved you may need to get more than just a replacment bearing you could need a repair bearing if the bearing groves in your axle are deep enough.
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Old 03-28-2013, 11:42 AM   #24
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Thank you for your very informative reply. This is exactly why i subscribed to this forum. Great knowledge to be grasped here. Honestly, not to sound like a dick, but cash flow is not a problem. I make good money. The only obstacle is the wife lol.
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Old 03-28-2013, 11:47 AM   #25
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I hear ya hehehe. Id have another mustang fully built right now accept my fiance said house first car second. Glad to help any questions you have at any point hit me up.
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Old 03-28-2013, 11:59 AM   #26
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I would live in my mustang if i had to. And the more i think about it in debating weather or not i should put all the time and effort into building my 2v up or i should just go with a cobra.
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Old 03-28-2013, 12:04 PM   #27
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Me personaly Id go for a Mach1 over a cobra.
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Old 03-28-2013, 12:08 PM   #28
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True that, So many options. So little time and money. I need to hit that power ball already.
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Old 03-28-2013, 12:09 PM   #29
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I guess wether or not you should go for a cobra depends on what your performance goals are. Also to take into account is cobras are all around more expensive.
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Old 03-28-2013, 12:18 PM   #30
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If I hit the power ball my daily driver would be a low 8 second mustang. Oh wait im already planning on building a 8 second mustang reguardless of the powerball just to keep up with 2 local Camaros and a 357W powered 85GT all running two stages of nitrous. Their cars are making in excess of 800hp to the tires. Their cars are all fully built on MT drag radials and I would love to be able to take them down a peg or two. Another guy won a chevelle on pinks and sold it to put a fully built engine using a dart block and twin turbos into his camaro that was already faster than a ligenfelter corvette by way of a 383 and again 2 stages of nitrous. This is the kind of competition I have here in the dallas area. Not to mention the countless 9 second awd imports and 1000hp cobras running around. Cant wait to get down into the low 8s and kick some ***.
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Old 03-28-2013, 12:21 PM   #31
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I hear ya hehehe. Id have another mustang fully built right now accept my fiance said house first car second. Glad to help any questions you have at any point hit me up.
Off topic but this is why i dont wanna get married! Lmfao
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Old 03-28-2013, 12:26 PM   #32
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Yeah well I have a daughter from a previous marriage and she has 2 kids from a previous marriage and we really needed a house and not just an appartment. Takes alot of money to raise 3 kids but I couldnt live without them. Hell sad part is she makes more money than I do so im actually Mr. Mom. I get military disability that pays for the house and she handles the rest of the bills. However I plan to start using my GI bill to go to college again this fall and Ill use the money from that to start building my 7th mustang.
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Old 03-28-2013, 12:34 PM   #33
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All i can say is wow. In my small town ohio having a stock gt im faster than 97% of everything around. I would rly like to put some money into a car but I'm not sure if this is the right one. I wish you the best diesel, if its a lot of hard work it'll pay off, it did for me anyways. Sure not having a wife and kid, the freedom is great but having a child is a bond that cant be put into words. I wouldn't have it any other way.
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Old 03-28-2013, 12:37 PM   #34
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Yeah well I have a daughter from a previous marriage and she has 2 kids from a previous marriage and we really needed a house and not just an appartment. Takes alot of money to raise 3 kids but I couldnt live without them. Hell sad part is she makes more money than I do so im actually Mr. Mom. I get military disability that pays for the house and she handles the rest of the bills. However I plan to start using my GI bill to go to college again this fall and Ill use the money from that to start building my 7th mustang.
What branch were u in? Thanks for your service brother.

---------- Post added at 01:37 PM ---------- Previous post was at 01:36 PM ----------

Quote:
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All i can say is wow. In my small town ohio having a stock gt im faster than 97% of everything around. I would rly like to put some money into a car but I'm not sure if this is the right one. I wish you the best diesel, if its a lot of hard work it'll pay off, it did for me anyways. Sure not having a wife and kid, the freedom is great but having a child is a bond that cant be put into words. I wouldn't have it any other way.
Im from ohio man where u at? Currently in cali though in the marines :/ haha i hate cali, no place like ohio!
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Old 03-28-2013, 12:45 PM   #35
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No place like ohio is right. 6 inches of snow at the end of march, right on! Lol. I live in troy ohio, about a half hour north of dayton ohio. Where are you stationed? My uncle who is a marines officer was stationed over there for years. Now he is at camp lejeune north carolina.
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