TheLion
Well-Known Member
- Thread starter
- #31
You have a Premium, I believe the Premium does have a 3.55, but could be wrong. Also the 18" wheels are 27.3" roll out, not 27" I used for calculations. Most people are using the Performance Pack 19" wheels with 255/40R19's which have a 27" roll out exactly. 285/35R19's on 19x10's have a 26.9" roll out and 235/50R18's have a 27.3" roll out, tt all affects gearing, but only by a few MPH so it may not be exact.I know. I am a terrible person. But seeing the posted "Top Speed" per gear/rear ratio. It says with 3.55's you will see approximate 95mph in 3rd.
That is what my stock non-PP EB runs. So do I have 3.55? I am peg legged bouncing off rev-limiter in 3rd and see 94-95. 18" Stock Goodyears also.
BTW I found on e-bay a used (10k miles on it) 2015 GT Performance Pack 3.73 rear end for $650 from a crashed car (front end collision). I confirmed as far as I can tell all performance pack GT's have the T2 and 3.73 where the traction lock and 3.55 are the standard equipment. I'll be sending back the 3.73 ring and pinion set from Summit I ordered for $300 as this is a much better deal.
For one, it should have the T2, it obviously has the 3.73 rear end I want and finally I don't have to mess with trying to tear it apart, finding, building or renting a diff case spreader. I can just unbolt the diff, drive shaft and pull / pop out the half shafts and swap them. I can also swap back if I were to have any issues for any reason.
https://media.ford.com/content/dam/fordmedia/North America/US/2015_Specs/2015_Mustang_Specs.pdf
Both the Torsen and the 3.73 are only listed under the GT Performance Package as it's not a factory option, but then again neither are any of the modification's most of us are doing...lol.
Here it is, basking it all of it's cast iron glory: http://www.ebay.com/itm/252469430946?_trksid=p2057872.m2748.l2649&ssPageName=STRK:MEBIDX:IT
Yes, confirmed this came out of a Performance Pack equipped GT, so it's not a conversion. The EB's and V6's probably never came quipped with the 3.73 because they have a slightly taller ratio version of the MT-82 and are more fuel economy minded, also they need to maintain separation between the GT and lower tier mustangs, so options are obviously limited intentionally, the V6 is the biggest proof of this as you can't even get it performance pack...
BTW many sites don't list the EB as compatible, not sure why, because the EB and V6 share the same gearing in MT-82, and all of them have the same axels and drive shafts to my knowledge. A few do however like lethal performance:
http://www.lethalperformance.com/fo...-loaded-differential-housing-3-73-torsen.html
The assembly number for the loaded diff is M-4001-88373T and it should have a sticker on it that say 3L73 and above that S253A:
http://www.ebay.com/itm/2015-15-FOR...ash=item41b03d47d2:g:9~sAAOSw-itXqmj8&vxp=mtr
Even $1k isn't bad for a low mileage rear end as they run about $1800 new. With only 10k miles on it for $650, that's a deal you wont find again!
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