if you are pushing more then 350 hp to the rear wheels then you may have to upgrade the axle to a 8.8" rear end, if not then you can get away with a FR Traction-lok or if you want to go higher the detroit locker 7.5" Difference is the detroit locker is always engaged so both tires will get the power. The FR T-lok has a clutch mechanism in it, and gives the wheel with the most traction more power, hence the limited slip name that comes with it.

It may be just as cheap to get a used 8.8 from a GT. Don't go to all the labor and expense and still just have stock v6 stuff. Get a lower mileage 8.8 from a gt and have it gone through with new bearing and gears of your choice.

yup. If you can find a modified one, even better.

If the labor's gotta be done anyway, they're gonna cost about the same, either way.

How'd you break the diff? Do you have a manual or automatic?

dollarbill said:

It may be just as cheap to get a used 8.8 from a GT. Don't go to all the labor and expense and still just have stock v6 stuff. Get a lower mileage 8.8 from a gt and have it gone through with new bearing and gears of your choice.

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As long as you've done a dyno tune, you should be fine.

How were you testing the car?

Rodstang01 said:

I have a auto trans and basically the only answer that I can explain how I broke the diff have to be when we were testing the car. Well thanks 2 you guys I have now a pretty good idea about which diff I will buy. However I want to ask you something in general. I Don’t have the knowledge that you guys have according to Mustangs so I want to ask you if all this you know the SC are safe for the car. What I mean is if there is no risk of blowing the motor or just broke a part after another. I am kind of afraid cuz now the car is really fast which is good but sometimes good don’t last long, so many thanks and I will be waiting for your answers.

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I really don’t know how he was testing the car. However he told me that the diff was making a noise so probable I will have to change it soon.



So look like my best choice is to go for an 8.8, but there is any other modification that I have to do in order to put the 8.8 in it?

Thanks a lot for your concern.

Can you post a pic of your diff? I'd be curious to se ethe failure point.

Nope, you just need to get an assembly from a salvage yard. Bolts right in.

Rodstang01 said:

I really don’t know how he was testing the car. However he told me that the diff was making a noise so probable I will have to change it soon.



So look like my best choice is to go for an 8.8, but there is any other modification that I have to do in order to put the 8.8 in it?

Thanks a lot for your concern.

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Ok I will as soon as I replace it. I have been so busy with school that I haven’t replace the diff yet. Probably this weekend I will do all that first replace the diff and then take it to a dynotune i am not sure if the Diablo sport takes care of all that . However I really want to take it to a dynotune as soon as I can.

How much will a dynotune cost?

depends on the shop . .. $100-$500. There's a big curve on that one, usually it depends on how soon they want to pay the dyno off . ..

Rodstang01 said:

Ok I will as soon as I replace it. I have been so busy with school that I haven’t replace the diff yet. Probably this weekend I will do all that first replace the diff and then take it to a dynotune i am not sure if the Diablo sport takes care of all that . However I really want to take it to a dynotune as soon as I can.

How much will a dynotune cost?

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Hey hello there. I have everything so far except the diff which I probably be putting this weekend. But yesterday I start the car and I saw a check engine, and well I put the Diablo sport and run the Diablo tune and after that the check engine was gone. My question is do I have to install the Diablo tune often or not cuz days ago the same thing happened and I took it to the mechanic and he put the Diablo sport and then was gone and yesterday the same. What can this be? Thanks.



The only thing holding me to buy a diff is that yesterday a friend of mine has a 2002 Mustang GT but he asks me about some numbers so I check mine and give it to him. I want to make sure it will fit. Well he ask me about the abs and all that cuz he said some cars has the abs just fwd. But mine has abs and I guess the abs in my car are in all wheels.

yeah, you're gonna' need an ABS rear. There is no car with only the front wheel ABS, it's all or nothing

You should be able to pul the code using the diablo unit.

Rodstang01 said:

Hey hello there. I have everything so far except the diff which I probably be putting this weekend. But yesterday I start the car and I saw a check engine, and well I put the Diablo sport and run the Diablo tune and after that the check engine was gone. My question is do I have to install the Diablo tune often or not cuz days ago the same thing happened and I took it to the mechanic and he put the Diablo sport and then was gone and yesterday the same. What can this be? Thanks.



The only thing holding me to buy a diff is that yesterday a friend of mine has a 2002 Mustang GT but he asks me about some numbers so I check mine and give it to him. I want to make sure it will fit. Well he ask me about the abs and all that cuz he said some cars has the abs just fwd. But mine has abs and I guess the abs in my car are in all wheels.

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Yeah but why the check engine appears, so I spouse If in the future I see the check engine again all I have to do is plug in the Diablo sport and run the tune.



Also I want to be sure on this, I have a boost gauge already in the car but when I accelerate only does like 8lb of boost. My question is: is it psi the same as pound of boost or is it different. The procharger that I bought I ask them to send the 11psi. Is that what is spouse to do in terms of boost or is something else? I really wanted to ask you this question long ago cuz I am really confuse with it.



The diff if the numbers match probably this week will be on I already talk to the mechanic that will do that.



Thanks a lot bro.

no, don't run the tune, pull the code. It should tell you what's wrong.

Or go to an autozone, and have them pull it for you.

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Don't let your mechanic test it this time!

:winks

Rodstang01 said:

Yeah but why the check engine appears, so I spouse If in the future I see the check engine again all I have to do is plug in the Diablo sport and run the tune.



Also I want to be sure on this, I have a boost gauge already in the car but when I accelerate only does like 8lb of boost. My question is: is it psi the same as pound of boost or is it different. The procharger that I bought I ask them to send the 11psi. Is that what is spouse to do in terms of boost or is something else? I really wanted to ask you this question long ago cuz I am really confuse with it.



The diff if the numbers match probably this week will be on I already talk to the mechanic that will do that.



Thanks a lot bro.

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boost usually refers to N2O, but some people say 11 lbs of boost, which is a short hand way of sayin' 11psi. (pounds per square inch)

Kscoyote I am sorry I haven post the pix of my diff here yet. It’s because I haven’t done my diff yet. I got some guy that is asking me $500 for a diff from a 2002 GT. And he is giving me everything with the diff but I only need the diff tho. But any ways I am working on it trying to find just the diff. Also do I need to program the car or something after I put the new diff? Can the Diablo sport do that? Also what set of gears do you recommend for my car. Can the stock Gt gears be a good choice? :eyebulge:



Thank you very much.

trust me, it'll be cheaper to install the whole axle, than taking it apart, and reassembling the unit. That's a pretty good price.

you would only need to reprogram if it had different gears. Ask to see what the gear ratio is. The Diablo can take care of it.

With the SC, you're better off keeping the 3.27s.

Rodstang01 said:

Kscoyote I am sorry I haven post the pix of my diff here yet. It’s because I haven’t done my diff yet. I got some guy that is asking me $500 for a diff from a 2002 GT. And he is giving me everything with the diff but I only need the diff tho. But any ways I am working on it trying to find just the diff. Also do I need to program the car or something after I put the new diff? Can the Diablo sport do that? Also what set of gears do you recommend for my car. Can the stock Gt gears be a good choice? :eyebulge:



Thank you very much.

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Now before I buy it I want to ask you if the brakes are compatible and everything, do I need any other modification and what about the length? Is it larger or the same as my v6? What I meant is the dimension of the rear Gt and the v6 dimensions. I am looking at a 2000 Gt. For $500. What do you think?

Also you said that I should keep 3.27 gears. Ok here is my question: Can I find a Gt diff with those gears or I have to put them. I really don’t want to get into changing gears. Because the GT diff come in different gear ratio. But I don’t want to hurt my engine either. So one more time thanks and I really appreciate what you are doing :winks

As long as they're compatible with your ABS system, everything will bolt on. The brakes are the same, the 2001+ cars have the same brakes as the GT. The dimensions are the same. It's purely a bolt in for a 2001+ car.

The GT if I remember correctly had the same gear ratio, but who knows what was installed in the car.

The way to check is to put the car in neutral, mark the driveshaft, and count the number of times the wheel turns to one turn of the driveshaft, while the rear of the car is on the stands.

If you turn the wheel 3 1/4 times for one revolution of the drive shaft, they're 3.27s, 3 1/2 turns, they're 3.55s, 3 3/4 turns = 3.73s, 4 turns are 4.11s.

Rodstang01 said:

Now before I buy it I want to ask you if the brakes are compatible and everything, do I need any other modification and what about the length? Is it larger or the same as my v6? What I meant is the dimension of the rear Gt and the v6 dimensions. I am looking at a 2000 Gt. For $500. What do you think?

Also you said that I should keep 3.27 gears. Ok here is my question: Can I find a Gt diff with those gears or I have to put them. I really don’t want to get into changing gears. Because the GT diff come in different gear ratio. But I don’t want to hurt my engine either. So one more time thanks and I really appreciate what you are doing :winks

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