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08-04-2007, 01:34 PM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
My Cobra began life with a wide ratio top loader and a 3.50 9" rear gear behind a 351W. Because I built the car as a cruiser and not as a race car I didn't like turning nearly 3000 RPM at 65 mph on the interstate. Fortunately, when the car was built I had modified the top loader bell housing to use a late Mustang cable clutch setup. Last year I swapped out the top loader for a super duty T-5 and matching late Mustang bell housing and flywheel. The hole in the tunnel for the shifter had to be slightly relocated and the rear trans cross member had to be modified. Also the drive shaft needed to be shortened a tad. I'm very happy with the results; smoother shifting and turning 1750 RPM in 5th at 65 MPH. Unless you are planning mega horsepower and a race machine, a well built world class T-5 will hold up nicely and perform well.
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08-05-2007, 06:00 PM
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CC Member
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Join Date: Apr 2007
Location: Chicago,
Il
Cobra Make, Engine: Superformance, 392 W
Posts: 16
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Not Ranked
I have a TKO 600 behind my stroker Windsdor. I had ordered a .82 5th gear but the .64 was installed by error. I am glad that it was, and I find 1st through 4th nicely spaced for the 3.46 rear end ratio in my car. I use 4th mostly cruising and up to about 55 mph then shift into 5th on the highway. I do not race, so I am very happy with the .64 final. Go for the 5 speed regardless, you will not be sorry that you did!
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08-05-2007, 06:07 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
4 speed = old school. 5/6 speed = new school. Much more user freindly and drivable.
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08-05-2007, 07:20 PM
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CC Member
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Join Date: Nov 2000
Location: Tucson,
Az
Cobra Make, Engine: Superformance 427 Side-Oiler
Posts: 2,156
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Not Ranked
Jdog-what is your 1st gear ratio?
JWD-a lot of ignorant peole come from the "new school".There isn't a TKO on the planet that shifts as smooth as a properly set-up Toploader.And lowering rpms in top gear has very little to do with driveability.
All of you who think cruising at 1700,2000,2300 rpm is great-think again.At those engine speeds,your advance isn't all the way in-you're actually LOSING MPG.
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08-05-2007, 07:21 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
I have a Jag 4pd with electic O/D ,which sometimes does'nt work and sometimes does.I would use a 5 spd for sure!!
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08-05-2007, 07:33 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
Quote:
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Originally Posted by Cobrabill
JWD-a lot of ignorant peole come from the "new school".There isn't a TKO on the planet that shifts as smooth as a properly set-up Toploader.And lowering rpms in top gear has very little to do with driveability.
All of you who think cruising at 1700,2000,2300 rpm is great-think again.At those engine speeds,your advance isn't all the way in-you're actually LOSING MPG.
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Bill
I come from the "old school". I've had cars with top loader's, M-22 Muncie's, super T-10's etc. and my TKO 600 shifts better than any of them. As far as your comment on vacuum advance, if it is hooked up to full vacuum like it should be , you WILL be getting the best mileage and performance. |
08-05-2007, 07:37 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
five speed
I have a TKO 600 2.87 1 St. and .64 5 Th.
5.0 stroked to 354, 3:55 rear gears, 323 rwhp & 375 rwtq
cruise at 1500 rpm 50 mph and 70 mph about 2000 rpm
20.8 miles per gal
I have a lot of low end torque which makes this combination great for cruising
Dwight
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08-05-2007, 07:58 PM
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CC Member
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Join Date: Mar 2001
Location: Cinnaminson,
NJ
Cobra Make, Engine: Cobra Fibercraft Bodies 427 S/C, 351W disguised as a 427.
Posts: 391
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Not Ranked
CobraBill, although it's true that all your mechanical advance may not be in by 2000 RPM, if your distributor has vacuum advance there should still be significant advance present because while cruising you will still have good manifold vacuum.
__________________
Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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08-05-2007, 08:22 PM
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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
If I were building from scratch again I would go with the TKO 600. I chose a toploader behind my 427 w/ 635 hp and a redline of 6800. I will be switching over probably this winter. I road race and on the longer tracks (Road America 4 + miles) where you can hit speeds in excess of 140 mph a .86 5th gear would be very nice.
However, my toploader is almost bullit proof because I have been racing the car in excess of 6000 miles without a single transmission issue. I am not sure the TKO will hold up as well.
Clois
=
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09-23-2007, 10:16 AM
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CC Member
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Join Date: Feb 2007
Location: Scottsdale,
Az
Cobra Make, Engine: ERA FIA #2119
Posts: 310
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Not Ranked
4 or 5
Thanks to all that responded.
I'm going with the 5spd.
sbk
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09-05-2009, 11:51 AM
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CC Member
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Join Date: Nov 2001
Location: Windham,,
Me
Cobra Make, Engine:
Posts: 1,590
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Not Ranked
A lot of us have been through the meat grinder on this one.I rebuilt a top loader used with Hurst comp plus shifter,it was a great setup.The problem was turnpike driving,and running the 460 hard.Solution! was a Tremec TKO and a 3:73 rear gear,making 1st gear an absolute spine crusher,5th gear overdrive made turnpike driving a pleasure.Not that I use the turnpike much,now I don't dread having to jump on it once in a while.
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