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09-18-2006, 10:00 AM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
to posi or not to posi
well, I ve driven a hundred miles an the pinion berring went south . i just love it . mo money.So i have to get a new one and the old one did not have posi ,so do i get one with posi- trac loc or torque lock ? I heard they make a banging noise when you turn? Ill change the rear end ratio to 3.50 at the same time. Does everybody have posi ?Does it change the handling? Any info would be nice. 
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the older i get the faster i was.
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09-18-2006, 10:03 AM
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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
Are you drag racing or road racing?
Bob
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09-18-2006, 10:05 AM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
road and street mostly
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the older i get the faster i was.
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09-18-2006, 10:09 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
I have had posi (Limited Slip Diff) in my Cobra for years and I have never had any problems with clunking or banging sounds. I believe you are thinking of a Detroit Locker where there is No Slip at all. Fords limited slip diff allows you to lay down two black tire marks if you want but it also provides a certain amount of slippage for normal driving. The posi or limited slip is active at certain torque loads.
I have a 8.8 with 3.50 gears and posi (LSD) in excellent cond I can sell you complete from brake to brake including the emergency cables for $350.00 plus shipping.
Clois
__________________
Sunshine, Asphalt and no stop signs...Perfect
"Let's roll"
"Be part of Something Good
......Leave Something Good Behind!"
from CD "Long Road Out of Eden"
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09-18-2006, 10:19 AM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
thanks clois, it has a 9" 28 spline with disks allready so all i need is the pumpkin. Ill keep it in mind.would it bolt in?
__________________
the older i get the faster i was.
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09-18-2006, 10:25 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
What ratio were you running? 3:50 sounds pretty low for street use, unless you got an overdrive trans. Yup, you DO want some kind of LSD, Posi, Locker or whatever.
The 8.8" does not have a 'pumpkin', by the way, gears are in the axle housing (like GM style).
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09-18-2006, 10:31 AM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
it had a 3.0 and i could barely drive it on the street.it was 1600 rpm in 5th at 70mph or 1500 rpm at 25mph in 1st. too much slipping the clutch.
__________________
the older i get the faster i was.
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09-18-2006, 10:39 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Oh, well there it is! The 5th gear (typically a .6) REALLY tall OD. .8 is much better, but even at that, with a 3.0 rear gear, whew, thats still a bad combination for rpm.
My guess is that you find 1st gear with a 3.5 rear gear to be ULTRA low, a real 'tire smoker'. With THAT combination I'd say some kind of posi would be a MUST HAVE! Even with a 3.5 you still might find the cruising rpm pretty low if you have a .6 OD. Sheeessshhh, there is no easy way out of this gearing delimna. Most likely you'll be around 2000 rpm where you used to be 1600, still kind of low depending on your cam profile.
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09-18-2006, 10:53 AM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
its a t-5z 2.95 first and .68 fifth. thanks for the imput . i saw a green cobra on the pali this summer ,wish we could have met up in oahu while i was there. .maybe next summer
__________________
the older i get the faster i was.
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09-18-2006, 12:13 PM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
I have a 0.6 Tremec with 3.73 rear gears.
At 100 MPH the revs are only 3000 RPM.
Go for it unless you like flying at 160 
I love the tall gears, especially with a small block. Sounds great around town.
__________________
Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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09-18-2006, 05:09 PM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
thanks all , i ordered up track lock with 3.5 gears.the diff guy said that the track lock was quieter and could handle more horses.heck ,whats another 700 bucks in the grand sceem of things. arg
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the older i get the faster i was.
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09-19-2006, 06:11 AM
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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
Ok frank, do ya have paint on that thing yet or are you driving it in the nude!!
She's probably getting you back for rushing her!
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09-19-2006, 07:42 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Green car on the Pali? Gotta be Flip, a Classic Roadster with 351, engine built by Don Scott. Nice guy, nice car. It's the only green one in town. 
Member, Cobra Watch Group
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09-23-2006, 10:03 AM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
yup, she's neckid.Now with a 3.50 track link posi . Man what a difference. i can drive in town and in parkng lots,verry nice and quiet. Now i hear the valve train'guess ill adjust them again. Next week to the BAR then a licence plate . Just movin along. Aloha,Peter
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the older i get the faster i was.
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09-23-2006, 10:10 AM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
hope to meet the hawaian groop of cobra owners ( next summer)they sound like a nice and tight groop.do they all meet some place and time ? aloha ,Peter
__________________
the older i get the faster i was.
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09-23-2006, 12:34 PM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Usually just the local 'cruise in's' and an occasional dinner. We were going to form a 'club' but nobody wanted to be 'President'. |
09-24-2006, 12:06 PM
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Senior Club Cobra Member
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Join Date: Mar 1999
Location: Honolulu,
HI
Cobra Make, Engine: CSX4141
Posts: 586
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Not Ranked
Well maybe one more can make a club?
Car is ocean bound, and arrives early next week. Just need to figure out
how to get it home? May have to flat bed it? Don't know if the HI DMV
offers a special one trip permit till I get it registered?
Sorry the above is off subject. By all means get a posi rear! 
- Bill - |
09-24-2006, 05:47 PM
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CC Member
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Join Date: Feb 2005
Location: Truckee and Kailua,
Ca
Cobra Make, Engine: B&B 351/402 Fi roller everything
Posts: 527
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Not Ranked
wasn't there a" slick willy "as president ?
__________________
the older i get the faster i was.
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