Differential Question...

[450nick]

Hi there folks!

I'm looking to try and get hold of an iron differential housing with a 3.55 ratio and the Torsen T2R differential inside. First question... Did any Mustangs have this in as standard? i.e is there any possibility I could get a used one from somewhere?

If not, what is the most efficient way to buy/build one? It seems to be difficult to buy new as they all come fitted with a traction lok which I don't need...

Thank you, Nick

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[I Bleed Ford Blue]

All S-550 mustangs have IRS with a super 8.8 rear, and I believe they are all aluminum housings. The torsen T2R was used in the last generation mustangs with a standard 8.8 solid (or live) axle rear housing and are not interchangeable with the newer models.

 

[450nick]

All S-550 mustangs have IRS with a super 8.8 rear

Thanks for the response! What do you mean by this?? What is IRS and Super 8.8 rear?

I'm looking to put this differential in my project car (not a Mustang) which has a double wishbone independent rear end. What do you think would be the best way to achieve this?

 

[I Bleed Ford Blue]

IRS is Independent Rear Suspension. The super 8.8 is ford's newest version of the IRS, the standard 8.8 is named because it has an 8.8 inch diameter ring gear. The super version has enough changes that no parts are interchangeable with the older models, hense the super in the name. Also the super is stronger than the older 8.8, all supers use 34 spline axle stubs, the older standard had either 28 or 31 spline axles. You can get a torsen for the super 8.8, it's standard equipment over here if you get the performance pack. Your best option is find a breakers yard that has a 2015+ mustang and get the whole IRS assembly out of it and use the parts you need. If you want a torsen or different gears, you can buy the parts new from ford racing.

Finally, get a torsen over a traction-loc, the trac-loc requires a friction modifier to be added to the gear oil and has wear parts that need replaced periodically. The torsen does not wear out and just needs plain gear oil. Here is a little video that explains how a torsen works

 

[Bluemustang]

2018+ PP auto cars come with them. I did just what you are suggesting. If you're a manual you could always get a 3.73 Torsen and swap gears. The pinion flanges are different in auto, manual and Gt350 cars.

 

[TexasRebel]

All S-550 mustangs have IRS with a super 8.8 rear, and I believe they are all aluminum housings. The torsen T2R was used in the last generation mustangs with a standard 8.8 solid (or live) axle rear housing and are not interchangeable with the newer models.

The 2015-17 Performance Pack GTs came with a 3.73 T2R in an iron housing.

Not all differential carriers were Super 8.8s (the 3.15:1 in the V6 for example).

 

[sabtaj1]

Contact my buddy eric at midway mustang in Dewitt Iowa... I am sure he has quite a few. midwaymustang.com/

 

[I Bleed Ford Blue]

The OP is in the UK, so he might stand a better chance looking over there.

 

[sabtaj1]

The OP is in the UK, so he might stand a better chance looking over there.

Oops.... I didnt catch that. HA, yes, way better looking over there.

 

[450nick]

Thanks guys, all good info.. There are actually very few used Mustang diffs around in the UK (this looks like it may be the right diff but 3.73 ratio so I'd need to change the crown & pinion gears, but it doesn't look very pretty and is quite expensive!) so I think I may as well order a new one from CJ Pony Parts (https://www.cjponyparts.com/ford-pe...iron-with-3-55-gears-2015-2020/p/M400188355B/). While researching a little more, it seems the the WaveTrac differential may be an even better option and isn't much more expensive - does anyone have experience of these? I'm going to be more on a road race track/fast road than I will a drag strip so both the T2R and the wavetrac would work I guess.

 

[bnightstar]

Finally, get a torsen over a traction-loc, the trac-loc requires a friction modifier to be added to the gear oil and has wear parts that need replaced periodically. The torsen does not wear out and just needs plain gear oil. Here is a little video that explains how a torsen works

If I have a car with traction-loc (euro cars don't have torsen) could it be swapped to torsen and what I need to do so ?

 

[I Bleed Ford Blue]

Yes you can, just get a torsen diff and a new set of bearings, then find someone who can do the install

 

[Cory S]

Not all differential carriers were Super 8.8s (the 3.15:1 in the V6 for example).

All S550's are Super 8.8's.

 

[TexasRebel]

All S550's are Super 8.8's.

Care to explain how the 3.15 carrier is different than all the rest?

 

[Cory S]

Care to explain how the 3.15 carrier is different than all the rest?

The carrier/diff itself is unique to match the 3.15 ring and pinion. The Carrier and pinion bearings are the same sized bearings as any other 2015+ Super 8.8.

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