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Old 12-18-2013, 12:08 PM   #1
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Rear end help!!!

So lately I have been having some noise coming from my rear end and after doing a bit of research online I think I've narrowed it down to the spider gears. Thing is I'm relatively new to working on cars and know nothing about spider gears. My question is...will it be easier/cheaper to get the spider gears fixed or would it be worth it to just upgrade n get a better differential? I am planning on putting in 4.10 gears...should I do this at the same time as fixing the spider gears or upgrading the differential?? Also was wondering what came stock in the 02 gt 28 spline or 31?? Can't find any info online. All work will b done by a shop can anyone give cost or advice?? Thanks in advance guys
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Old 12-18-2013, 12:45 PM   #2
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Gears alone is usually an $800 job for parts and labor from a shop which is really high IMO but it is what it is. The stock differential is a 28 spline setup. I mean, if you have the money to spend its a good time to do it all at once with a 31 spline rear/31 spline axles and new gears but just make sure its really the gears before you spend all that money and then it doesn't fix the problem.
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Old 12-18-2013, 12:48 PM   #3
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28 spline came stock in 99-04 I would upgrade the differential and maybe axles to 31 spline. I did my swap for 120$ at a shop because I helped with labor.
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Old 12-18-2013, 12:53 PM   #4
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Gears alone is usually an $800 job for parts and labor from a shop which is really high IMO but it is what it is. The stock differential is a 28 spline setup. I mean, if you have the money to spend its a good time to do it all at once with a 31 spline rear/31 spline axles and new gears but just make sure its really the gears before you spend all that money and then it doesn't fix the problem.
Ya ill def get it diagnosed first. If I do upgrade to the 31 spline rear and axles is there anything else I will need? Like bolts/bearings...any misc items along those lines?? Thanks again for the input
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Old 12-18-2013, 12:59 PM   #5
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$800 is expensive for a gear change Scotty, my guy quoted me around $450 parts and labor.

Id, save up and do the whole thing at once OP. The axles, differential, bearings and gears. It doesn't make sense to replace the spider gears in a trac loc.
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Old 12-18-2013, 01:04 PM   #6
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$800 is expensive for a gear change Scotty, my guy quoted me around $450 parts and labor.

Id, save up and do the whole thing at once OP. The axles, differential, bearings and gears. It doesn't make sense to replace the spider gears in a trac loc.
Fair enough thanks, is there a certain diff u could recommend?
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Old 12-18-2013, 01:28 PM   #7
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Fair enough thanks, is there a certain diff u could recommend?
I think that the one in my car is an Auburn. I autocross my car and I'm not sure how I feel about it for corners. It works good in a straight line though.
I believe, almost any quality aftermarket diff will outperform the trac loc.
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Old 12-18-2013, 02:39 PM   #8
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I had a grinding noise in my car turned out to be the carrier bearing. The gears were fine so I just had a bearing kit put in.
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Old 12-18-2013, 02:56 PM   #9
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I had a grinding noise in my car turned out to be the carrier bearing. The gears were fine so I just had a bearing kit put in.
Where can u purchase the bearing kit?
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Old 12-18-2013, 02:58 PM   #10
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I got mine from rock auto
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Old 12-18-2013, 07:43 PM   #11
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$450 is fair and I would not pay $800, just saying what a lot of shops do quote. Its one of those things they know most ppl can't do, not like an exhaust or something where any backyard mechanic can do it with jackstands and hand tools. Shop around here does gear installs for $600 and you supply the parts... yeah...

At any rate, the Eaton is the basic stock style upgraded 31 spline with the puck style clutches. The Auburn uses cone style clutches. Both are good.
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Old 12-20-2013, 12:55 AM   #12
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What's the difference between the trac lok and the T-2 Torsen or the FR500S differentials???
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Old 12-20-2013, 06:54 AM   #13
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Your other option is the 31 spline ford racing diff. Same as what came in cobra and mach cars. Best part is they are under $200.
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Old 12-20-2013, 07:38 AM   #14
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Your other option is the 31 spline ford racing diff. Same as what came in cobra and mach cars. Best part is they are under $200.
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Old 12-20-2013, 11:09 AM   #15
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Yeah that's the one I meant by the trac lol because on AM they sell it as a 31 spline
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