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CC Advertisers
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09-15-2008, 11:05 AM
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CC Member
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Join Date: May 2007
Cobra Make, Engine:
Posts: 88
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Not Ranked
tko-600... .082 or .064
I'd like to hear some opinions on what is a better 5th gear for my 351w. bored and stroked to 410. 475 hp475# torque. Rear end is 354. Thanks
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09-15-2008, 11:30 AM
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Senior Club Cobra Member
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Join Date: Oct 2006
Location: Santa Cruz,
CA
Cobra Make, Engine: SPF 2613 Titanium w/Black, Roush 402SR
Posts: 4,097
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Not Ranked
Here's a few threads on the subject.
http://www.clubcobra.com/forums/sear...earchid=700038
I've got the .082 5th in an SPF with a Roush 402SR and it's perfect for freeway cruising.
__________________
Doug
No stop signs, speed limit - Nobody's gonna slow me down - Like a wheel, gonna spin it
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09-15-2008, 01:01 PM
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CC Member
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Join Date: Aug 2006
Location: Van Buren, AR,
AR
Cobra Make, Engine: B & B , 351W 400+
Posts: 153
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Not Ranked
I have the .82 with a 3.25 posi rearend. Maybe not a racing set up but 5 real nice useable gears. 351W around 400 HP.
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09-15-2008, 01:20 PM
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CC Member
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Join Date: Apr 2004
Location: Frederick,
CO
Cobra Make, Engine: SPF Roadster, 418W
Posts: 385
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Not Ranked
I've got the .64 in a 418 Windsor, 3.73 gears. It is way too tall for my driving. On the highway at 80 mph, the engine is still in preignition (detonation) range if I need to accelerate with any enthusiasm.
Terry
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09-15-2008, 03:20 PM
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CC Member
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Join Date: May 2007
Cobra Make, Engine:
Posts: 88
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Not Ranked
thanks
Lookas as though 082 is the way to go.. Thanks
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09-15-2008, 04:00 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Not Ranked
I have a T-56 behind a 418.It has a .82 5th gear and a .64 6th.
6th is not used all that often,it is a highway economy gear at about 80 mph and up.Which is nice.
If I had to chose which of the two I had to give up,it would be the .64.
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09-15-2008, 04:08 PM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Carrollton,
TX
Cobra Make, Engine: JBL now SOLD
Posts: 1,735
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Not Ranked
Hey Fred....what gears do you have in the rear?
__________________
6th generation Texan....
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09-15-2008, 04:13 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Not Ranked
John,how's the ole head.
Hope back to "normal". 
I have a 9" Ford with 3.70 gears with 315/35-17 tires. |
09-15-2008, 04:45 PM
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CC Member
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Join Date: Jan 2008
Cobra Make, Engine: Unique
Posts: 153
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Not Ranked
.82
I just started working the bugs out of a FE with the .82 and a 3.42 rear and love it.
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09-15-2008, 04:47 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
It's a no brainer, .82 everytime!
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09-15-2008, 05:15 PM
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CC Member
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Join Date: Feb 2001
Location: St. Louis, Missouri,
MO
Cobra Make, Engine: SPO 2715
Posts: 1,648
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Not Ranked
Quote:
Originally Posted by diegokid
I just started working the bugs out of a FE with the .82 and a 3.42 rear and love it.
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Hey Kid,
I am having my SPF built now, 3.46 Dana rear, I am using the Avon 295/50/15 rears (26.7" diameter).
Isn't 26-2800 rpms a lot to cruise at? (70 mph)
Thanks for posting, would like to get your opinion since you have the same setup I am getting.
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09-15-2008, 05:21 PM
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Senior Club Cobra Member
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Join Date: Feb 2004
Cobra Make, Engine:
Posts: 1,226
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Not Ranked
.82 and 3.27 rear end. PERFECT!!!
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09-15-2008, 05:53 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 21,924
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Not Ranked
3.54 rear, .64 trans, and an FE that is comfortable at 2000 RPM. Doing 68MPH at 2000 RPM lets me chat with my passenger as the wind noise is actually louder than the pipes. BUT, if your engine is snotty below 2300 or so, don't think about the .64 -- I love mine though. |
09-15-2008, 05:56 PM
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CC Member
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Join Date: Dec 2006
Cobra Make, Engine: CSX 4000; Shelby aluminum FE with 58mm IDAs
Posts: 1,116
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Not Ranked
Quote:
Originally Posted by Great Asp
Hey Kid,
I am having my SPF built now, 3.46 Dana rear, I am using the Avon 295/50/15 rears (26.7" diameter).
Isn't 26-2800 rpms a lot to cruise at? (70 mph)
Thanks for posting, would like to get your opinion since you have the same setup I am getting.
E
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I would suggest you go with the .82 OD. I have a 3.42 rear, a TKO-600 with the .82 OD, and an 511" FE and am very happy with this combination. |
09-15-2008, 06:05 PM
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CC Member
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Join Date: Feb 2001
Location: St. Louis, Missouri,
MO
Cobra Make, Engine: SPO 2715
Posts: 1,648
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Not Ranked
Quote:
Originally Posted by Stentor
I would suggest you go with the .82 OD. I have a 3.42 rear, a TKO-600 with the .82 OD, and an 511" FE and am very happy with this combination.
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Stentor, thanks for posting.
What rpms are you running at 70 mph cruise, and does it feel like too much?
Thanks!
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09-15-2008, 07:54 PM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,501
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Not Ranked
Rather than opinions, why not let the use determine which way you go? Do you do more highway/freeway driving over long distances where the higher ration would serve better? Do you do mostly around town driving where the lower ratio would serve better? They both work well. I have a 428FE with a 3.56 rear end and a TKO with the .64 to serve on road trips out of the heat of the valley. I love it. If I keep the speedo between 65 and 70, I can get 15.5MPG. That's pretty impressive for a car that gets 10 MPG around town.
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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09-15-2008, 10:13 PM
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CC Member
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Join Date: May 2005
Location: entiat,
wa
Cobra Make, Engine: ERA 713 427 stroker 468ci
Posts: 83
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Not Ranked
I started with the 0.64 and the 3.31.it was way to tall, about 1800 rpm @ 70.changed out tranny with the 0.82. Its perfect now 2400 rpm @ 70. |
09-15-2008, 11:07 PM
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Senior Club Cobra Member
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Join Date: Sep 2002
Location: Montgomery,
TX
Cobra Make, Engine: CR 427 S/C, 351W, 5 Sp & KMP142 - 427 SO, 4 Spd
Posts: 2,212
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Not Ranked
My CR has a 351w with 400+ ponies and torque, I have a 3.27 rear and a
T-5z with the .64. I'm about 78 mph at 2k and it was a little steep until I
started adding 1 gallon of 110 avgas per about 10 gal of our 92 octane here
and it made all the difference for me. I can cruise at 60 no problem in 5th,
if I need some extra there is always 4th close by. Here on Oahu there aren't
many places to go much faster and if busted for over 80 it is jail time.
Nice weather but no roads and way to many 5 0's running around with their
lasers. 
__________________
Flip
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09-16-2008, 02:36 AM
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CC Member
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Join Date: Oct 2006
Location: Virginia Beach,
va
Cobra Make, Engine: BDR #250
Posts: 234
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Not Ranked
Get a six spd and have both...Mac
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09-16-2008, 05:57 AM
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CC Member
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Join Date: May 2005
Location: entiat,
wa
Cobra Make, Engine: ERA 713 427 stroker 468ci
Posts: 83
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Not Ranked
1/1 to 1/0.64 was just to big a leap for me.I was lucky to find a buyer at an auto swap meet for my 0.64 tremec 600 for $400 less than I had paid so it.was'nt that big of mistake.I would recommend the 0.82.
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