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CC Advertisers
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06-26-2016, 02:20 PM
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CC Member
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Join Date: Aug 2013
Location: Tampa,
Fl
Cobra Make, Engine: Backdraft 347
Posts: 38
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Not Ranked
giving up
my woes with .082 5th gear and 3.44 rear end at 3000 rpm at 77mph ,its change out t5 or lower rear end and give up all the accelaration
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06-26-2016, 02:58 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,601
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Not Ranked
Change the rear ...I have the same T5 with a 2.88 rear
2500rpm I'm doing 80 at least
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06-26-2016, 02:59 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,601
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Not Ranked
Also Im changing my wheels and tires for 27 inch diameter tires, most are 26 inch , and stock is 28 inch
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06-26-2016, 03:12 PM
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CC Member
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Join Date: Aug 2009
Location: Phoenix,
AZ
Cobra Make, Engine:
Posts: 1,956
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Not Ranked
Keep your acceleration and get a real overdrive.
I've had .6 then .8 and now back to .6.
__________________
FFR MK1---Sold
Superformance #884 --- Sold
No more Furds.
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06-26-2016, 03:16 PM
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CC Member
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Join Date: Sep 2008
Location: Austin,
TX
Cobra Make, Engine: ERA FIA, 351W
Posts: 765
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Not Ranked
What is your first gear? 3.27? 2.87?
Betcha don't much notice accelaration with a 3.07ish gear...esp if it's the 3.27 1st gear
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06-26-2016, 04:34 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
do you have a T-5 or a TKO?
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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06-26-2016, 05:31 PM
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CC Member
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Join Date: Aug 2009
Location: scottsdale,
az
Cobra Make, Engine: FF5 347 stroker
Posts: 867
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Not Ranked
I had first gear changed so it wasn't a granny gearing, taller gear so did not have to shift at 10 mph. In fifth gear just under 2100 rpm and 75 mph. Running 3.56 rear end. T 5 trans.
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06-27-2016, 12:47 AM
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CC Member
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Join Date: Feb 2006
Location: Gilroy,
CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,726
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Not Ranked
OP, a 0.82 OD TKO with a 2.92 R&P and 295x60x15 rears will put you at 2000 rpm at about 70 mph. It will have almost exactly the same first gear as a close ratio top loader and a 3.73 R&P — T/L first gear 8.38, TKO first gear 8.65!
If the car is not uncontrollable in first gear the problem is more steam in the boiler.
Ed
__________________
Help them do what they would have done if they had known what they could do.
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06-27-2016, 05:46 AM
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CC Member
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Join Date: Jun 2006
Location: wellington,
oh
Cobra Make, Engine: BDR #260 w/ 347 stroker, Canfield 195 cc heads, prosystems carb on a VicJr, Comp roller cam
Posts: 225
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Not Ranked
295 50 15 rear tires, 3.91 diff gear ratio, T5WC with .062 5th gear...and 347cid SBF with 375 HP to wheels at 5900rpm's. Love it! great acceleration but around 1800 rpms at 60 MPH...what is not to like? 
BTW, just listed an open 3.91 ratio E36 diff.
__________________
BDR#260...21.6K miles logged as of 4/2018 
www.motorheadsohio.com We are an engine machine shop, specializing in crankshafts!
47 years of doing business an going strong! stop on by for a personal tour of the shop
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06-27-2016, 01:16 PM
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CC Member
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Join Date: Feb 2006
Location: Alexander,
AR
Cobra Make, Engine: B&B 427 Stroked Windsor TKO 600 w/3.50 posi 9"
Posts: 789
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Not Ranked
I run a TKO with .6 final and 3.55 rears, perfect match form me!
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