Change differential 3.15 on 3.55.

[TeeLew]

I’ll add this: Changes to the diff should only be completed by a professional. If you don’t know what you’re doing, leave it alone and hire a pro to perform the work.

I hope this is satire.

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[TeeLew]

You won't have to change anything in the programming of the car. The Car will auto detect that ratio.

Are you sure about this? There is a place to designate the rear end ratio in the ForScan software.

 

[any_key]

That depends on the size of your tires.

Size tyre rear wheels 305\30\20

 

[any_key]

ForSCAN settings when changing gear

 

[Hoofer]

I hope this is satire.

Hey genius, fact that you quoted me shows you don’t know what you’re talking about.

A friend had their Mustang rear end modded by their friend who was a so called “expert”.

It only took an extra $700 parts/labor by a pro to fix the “experts” work.

 

[bankyf]

Are you sure about this? There is a place to designate the rear end ratio in the ForScan software.

I was going to ask the same thing... Speed is read from a wheel speed sensor, so a gear change won't affect the speedometer, but I would have to imagine that the ratio is in there for a reason. On a manual car it might not matter, but I'm guessing it will be more important on an auto car.

 

[GilmourD]

Hey genius, fact that you quoted me shows you don’t know what you’re talking about.

A friend had their Mustang rear end modded by their friend who was a so called “expert”.

It only took an extra $700 parts/labor by a pro to fix the “experts” work.

I can get behind this thought... I'm dealing with an exhaust install complicated by a previous owner welding slip-on adapters onto the pipes... Backwards... In the wrong place... Then forcing everything together causing stress cracks that split the mid-pipe (which is factually already being replaced). And that's an exhaust, which is much simpler than replacing rear gears!

Now, if you do know what you're doing then have at it!

 

[MrMike]

I seem to remember from other threads that totally rebuilding a diff is a delicate/sensitive procedure and requires some practice.

I have a bunch of bookmarks saved on it and JohnVallo is very experienced at it.

Good thread here: https://www.mustang6g.com/forums/threads/inside-the-super-8-8-rear-end.150514/

I did a lot of reading since I was trying to determine swapping in a used Torsen vs completely building a while ago. I'm going to re-evaluate next year, but there is logic to swapping the driveshaft and doing other rear end work at the same time since everything will already be apart anyway.

 

[ShadesOfBloo]

I’ll add this: Changes to the diff should only be completed by a professional. If you don’t know what you’re doing, leave it alone and hire a pro to perform the work.

If you wanted to leave the rear end housing in the car, pull out the ring and pinion, install a new ring and pinion, and have them aligned properly, I'd take the car to a professional for that.

The OP has a whole rear end assembly to swap, and that operation isn't nearly as sensitive.

 

[ShadesOfBloo]

I have yet another concern, because any_key has an automatic transmission. If it's like the automatic Mustang I drove and the transmission computer is stupid, a different final drive might just make the transmission quicker to shift up. Instead of going uphill in a 50 km/h zone in 5th gear, it might go to 6th.

No matter what you do with the hardware, be ready to click the shift paddles and override the software.

After enough days or weeks of telling the transmission what gear you want, it might understand the assignment. In theory.
However, I just found this thread where owners talk about the transmission's "adaptive learning". They're not impressed with it, and they're talking about ways to turn it off:
https://www.mustang6g.com/forums/threads/10r80-adaptive-learning-question.188344/

 

[HKusp]

The OP has a whole rear end assembly to swap, and that operation isn't nearly as sensitive.

Yes, but when the person stated that it should be done by a professional, the OP hadn't mentioned that fact yet.

 

[any_key]

Stop stop! =)
Technically, I understand how it should work and what amount of work needs to be done to replace the unit. But the replacement will be done by service specialists, my task is only to bring them what I need.
What kind of oil should I use? Original or Motul?

And if we're talking about the rear end in general, do we need to install bushings in the subframe STEEDA or is this a useless upgrade?

 

[lo-fi]

Stop stop! =)
Technically, I understand how it should work and what amount of work needs to be done to replace the unit. But the replacement will be done by service specialists, my task is only to bring them what I need.
What kind of oil should I use? Original or Motul?

And if we're talking about the rear end in general, do we need to install bushings in the subframe STEEDA or is this a useless upgrade?

Great time for the steeda alignment and bushings kit to go in. I would definitely do that.

 

[any_key]

Great time for the steeda alignment and bushings kit to go in. I would definitely do that.

STEEDA does not have delivery to my country (((You need to look for delivery options or drawings, but I really like this kit and understand that it will not be superfluous.

 

[TeeLew]

Hey genius, fact that you quoted me shows you don’t know what you’re talking about.

A friend had their Mustang rear end modded by their friend who was a so called “expert”.

It only took an extra $700 parts/labor by a pro to fix the “experts” work.

Cool story.

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