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01-24-2007, 01:18 PM
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CC Member
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Join Date: Jul 2005
Location: Punta Gorda,
Fl
Cobra Make, Engine: SPF 2473, Roush 427R
Posts: 203
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Not Ranked
Superformance rear end
I have a new SPF (2473). Can Anyone give me a description of the factory rear end in my car ( rear axle ratio)? I didn't order anything special, just the standard rear. Thanks
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01-24-2007, 01:39 PM
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CC Member
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Join Date: Aug 2006
Location: Jersey Shore,
NJ
Cobra Make, Engine: Superformance SPF#2572, 427 S/O 2X4
Posts: 379
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Not Ranked
You should have a 3.46 ratio differential in your car.
__________________
Peace through superior firepower...or is it horsepower? Either way, more is always better!
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01-24-2007, 02:43 PM
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Senior Club Cobra Member
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Join Date: Jan 2001
Location: Bloomfield Hills, (Detroit area),
Mi
Cobra Make, Engine: Superformance 156, ex Paxton 351, now a 392 Ford Racing Stroker
Posts: 1,666
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Not Ranked
older cars had Ford IRS rear ends ( 3.73 ratio ) , from a 94-97 TBird I recall .
The newer ones, like in your late serial car, are BDR rear ends, which I believe are the same ones in the Brock/SPF coupe and have the lower 3.46 ratio as Archrms stated.
Enjoy your car and its many smiles to the miles ! Bill
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01-24-2007, 02:44 PM
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Senior Club Cobra Member
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Join Date: Aug 2005
Location: Toronto, Canada,
Ont
Cobra Make, Engine: Shelby CSX 4995, Keith Craft built 427 SO
Posts: 1,168
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Not Ranked
The local SPF dealer tells me it is probably a 3.46, unless you ordered something else.
__________________
"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American 
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01-24-2007, 05:02 PM
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CC Member
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Join Date: Jan 2007
Location: Santa Maria,
Ca
Cobra Make, Engine: 2001 SPF, Sold =(
Posts: 300
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Not Ranked
So, does that mean my 2001 SPF car has a Ford T-bird diff in it? And would it have the same gear ratio as the newer SPF cars?
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01-24-2007, 05:10 PM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
I have SPF642. I've got the 3.73 with a Tremec 0.68 OD. I really wish I had the 3.46 with a 0.80 OD. It would make the the gap from 4th to 5th more in line with the first 4 gears. It would also yield about the same final gear ratio 2.53 vs 2.77.
Bob
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01-24-2007, 05:30 PM
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CC Member
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Join Date: Oct 2006
Location: Des Moines,
IA
Cobra Make, Engine: SPF 545" stroked 460 - sold
Posts: 239
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Not Ranked
Quote:
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Originally Posted by Powershift1038
So, does that mean my 2001 SPF car has a Ford T-bird diff in it? And would it have the same gear ratio as the newer SPF cars?
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Yes, you would have the Ford differential but it would be 3.73 not the 3.46 used in the newer cars  |
01-24-2007, 05:41 PM
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CC Member
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Join Date: Jul 2005
Location: Punta Gorda,
Fl
Cobra Make, Engine: SPF 2473, Roush 427R
Posts: 203
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Not Ranked
Thanks for the info!!
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01-24-2007, 06:46 PM
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CC Member
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Join Date: Jan 2007
Location: Santa Maria,
Ca
Cobra Make, Engine: 2001 SPF, Sold =(
Posts: 300
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Not Ranked
Quote:
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Originally Posted by Velox
Yes, you would have the Ford differential but it would be 3.73 not the 3.46 used in the newer cars |
Thanks for the info from me too! |
01-24-2007, 09:22 PM
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CC Member
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Join Date: Feb 2003
Location: Morgan Hill,
CA
Cobra Make, Engine: SPF 2293, Roush 427R-228
Posts: 298
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Not Ranked
I'm no expert, but I was told the rear end is an aussie unit from BTR. Similar to a dana 44, but not exactly the same. Different gear sets are somewhat difficult to find if your looking for a ratio swap. I have the same in my SPF.
Daryl
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01-25-2007, 04:54 AM
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Senior Club Cobra Member
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Join Date: Jan 2001
Location: Bloomfield Hills, (Detroit area),
Mi
Cobra Make, Engine: Superformance 156, ex Paxton 351, now a 392 Ford Racing Stroker
Posts: 1,666
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Not Ranked
Daryl - thanks for the memory jog, you forced me to go back to my notes . you are right , it is a BTR ( not BDR ) rear end - my goof .
my notes from late March 2005 from SPF -USA HQ ( in Virginia then ) said :
They were switching the roadster MK III rear ends from a Ford unit to a BTR unit . This was to occur at about SPF chassis number 2068 .
BTR was a susidiary of Dana in Australia - and BTR was also the supplier of the Coupe rear end . although limited slip might be different , hydraulic on the coupe and cone on the MK III . at that time someone told me the BTR part number was " 0180-000007".
supposedly several rear ratios were available with the BTR unit , but 3.46 was what SPF was going to use then as their standard ratio .
now, why I hard copied and kept that email note is beyond me ...
as an aside, it was about the same serial numbered chassis where SPF also stopped using the center rod on the windshield . trivia for ya ...now, when they started using the center rod , can't help ya there . my old 156 does not have one . Bill.
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