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11-06-2004, 03:19 PM
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Senior Club Cobra Member
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Join Date: Jan 2004
Cobra Make, Engine: In Limbo for the time being
Posts: 118
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Not Ranked
TKO600 .82 or .64
Ok,I am going to get a TKO600 but I am undecided on weather to get a .82 or the .64 5th gear . I will not be doing any type of racing just cruising and playing on the street. I am concerned that the .64 may be too much of a drop in RPMs but for the highway it may be ok . I am running a 3.55 posi rear and 295/50/15 rear tires.The motor should be about 340 RWHP. I have gone and ran my numbers on the gearing calculators but I need some input from a few who may have one or the other ,let me know.
Thanks Chris
Last edited by ChrisL; 11-07-2004 at 04:16 AM..
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11-06-2004, 03:38 PM
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Senior Club Cobra Member
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Join Date: Sep 2003
Location: Kingwood,
WV
Cobra Make, Engine: SPF 2682, Roush 427
Posts: 219
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Not Ranked
A 0.68 with a 3.91 rear is just about right. With a 3.55 rear I would go with the 0.82. Run the numbers.
Chet
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11-08-2004, 05:35 AM
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CC Member
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Join Date: Jun 2003
Location: Hunterdon County,,
NJ
Cobra Make, Engine: ERA 427 SC with 428 PI
Posts: 390
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Not Ranked
I have a TKO with .62 and 3.31 rear and I find 5 th is only good on the highway @ 65 + mph.
__________________
"Is it original ?" -- " Yes! But some parts are new."
It's just easier this way.
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11-08-2004, 05:57 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,596
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Not Ranked
I am running the 3:27 gears and a .6 split and I agree with ERA649. The 5th gear is strictly a freeway gear and only then when not in heavy traffic. At 70 MPH I tach 1900 RPM. Way to low in the engines power band to do anything but cruise. I think that if I had a chance to do it over I would go to the .8 with the gears Iam running. Gears below 3:55s I think would be ok with the .6 split.
Ron
Last edited by Ron61; 11-09-2004 at 05:38 AM..
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11-08-2004, 10:56 AM
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Senior Club Cobra Member
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Join Date: Jun 2003
Location: West Linn,
OR
Cobra Make, Engine: ERA #684, 428 FE, TKO600
Posts: 1,378
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Not Ranked
Chris:
.82 fifth, 3.07 rear end, 17" wheels/tires. 2300RPM@70MPH in 5th. Wind noise is louder than the exhaust at that speed and about 15MPG with a 428FE.
DonC
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11-08-2004, 11:18 AM
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Senior Club Cobra Member
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Join Date: Jun 2000
Location: Gilford,
NH
Cobra Make, Engine: FFR 302 carb
Posts: 8,121
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Not Ranked
I'm running a t-5 with .62 5th. 3.27 rear gear. It is great for freeway cruising. After all, isn't this what 5th is for? Lower cruise RPM, increase fuel mileage. When I need to pass, it's no big deal to down shift to 4th.
Mike
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11-08-2004, 11:58 AM
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Senior Club Cobra Member
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Join Date: Mar 2002
Location: God's country,
ME
Cobra Make, Engine: Original ERA 427sc, Powered by Gessford
Posts: 2,678
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Not Ranked
Quote:
Originally posted by mikiec
I'm running a t-5 with .62 5th. 3.27 rear gear. It is great for freeway cruising. After all, isn't this what 5th is for? Lower cruise RPM, increase fuel mileage. When I need to pass, it's no big deal to down shift to 4th.
Mike
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Mike-
Depending on the specs of your cam and the rear gear you are running, the .62 5th can drop you too far out of the engine's powerband to run efficiently- which I think is what Ron and ERA649 are referring to.
I have the .82 5th with a 3.31 rear and at 70 I think its turning about 2400, which is just pretty good. Even at that low rpm, the motor has enough torque that I can pass without a problem simply by pressing the gas pedal- no need to down shift. If I had the .62 5th, I think the motor would be lugging too much and I would have to down shift. But it really depends on your cam and rear gear ratio.
__________________
Replica is not a dirty word.
"If you can't be a good example, then you'll just have to be a horrible warning."
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11-08-2004, 12:58 PM
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CC Member
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Join Date: Dec 2003
Location: Lehigh Valley, PA,
PA
Cobra Make, Engine: Look-a-like cobra POS
Posts: 955
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Not Ranked
See if this makes sense.........
The TKO 600 with a 3.55 rear ratio is very close (within 2 mph across the gear and rpm spectrum ) to a wide ratio toploader and also utilizing a 3.55 rear ratio. This was the generally the standard ratios back in the '60s.
So, depending on your cam,
You can either run: 52mph @ 2000rpm with a .82 5th gear
or..
You can run: 67mph @ 2000rpm with a .65 5th gear
Hope this helps.
Regards, Bret.
__________________
B. Ewing
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11-08-2004, 04:57 PM
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CC Member
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Join Date: Sep 2002
Location: Tucson,
AZ
Cobra Make, Engine: ERA 427" 351W
Posts: 562
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Not Ranked
Chris, I have a TKO 600 w/ .82 OD and 3.54 rear gears. 70mph on the freeway is 2600 rpm. I really like the "road race" feel of this gear selection.
__________________
Al W.
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11-08-2004, 05:42 PM
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CC Member
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Join Date: Jun 2003
Location: Hunterdon County,,
NJ
Cobra Make, Engine: ERA 427 SC with 428 PI
Posts: 390
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Not Ranked
Bret,
I think it's 58.6 mph in 4th and with .82 63 mph @ 2000.
and everyone knows I never drive faster then 65 mph- the legal limit in NJ.
Running the engine less then 2000 is lugging it.
__________________
"Is it original ?" -- " Yes! But some parts are new."
It's just easier this way.
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11-09-2004, 05:05 AM
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CC Member
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Join Date: Dec 2003
Location: Lehigh Valley, PA,
PA
Cobra Make, Engine: Look-a-like cobra POS
Posts: 955
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Not Ranked
ERA,
TKO 600 with .82 5th gear
295-50-15 rear tires
3.55:1 rear axle ratio
2000 rpm @ 1st gear - 15 mph
2000 rpm @ 2nd gear - 23 mph
2000 rpm @ 3rd gear - 34 mph
2000 rpm @ 4th gear - 43 mph
2000 rpm @ 5th gear - 52 mph
Regards, Bret.
__________________
B. Ewing
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11-09-2004, 05:45 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,596
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Not Ranked
Chaplin hit my problem right on the head. My engine doesn't even get past the lugging stage until I get around 2500 RPM. I could change tire sizes and help a little but just put up with this as when there isn't a lot of traffic I keep it above 2000 RPM which also puts me above the 70MPH speed limit. I don't do much freeway driving as I prefer the back roads and there I hardly ever use 5th gear. My big block has 3:91 gears and that is a whole other story. Both engines have rather radical cams but I did cut the one in the big block back from 312 duration and .630 lift to 286 duration and .560 llift with a change in overlap and I like it much better.
Ron
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11-10-2004, 06:20 PM
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CC Member
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Join Date: Jun 2001
Location: Washington DC Metro (Virginia),
VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
Posts: 1,895
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Not Ranked
Chris L,
Given your 340 or so RWHP (warm 302, or 351W), and cruising and playing on the street intended use, I think you'd be happier with the T-5Z (2.95 1st) for this application.
Shifts like a Honda, and the gear ratios are right. You'll have to get it from a trans shop that can swap out the .62 OD gear for something a little taller like a .73, or .80. And it fits any Five Oh 5 speed bellhousing, the cable clutch fits.
I got mine new, blueprinted, with the .73 OD, and have 3.55 diff gears from Liberty Racing Transmissions in Livona, MI. Put a Hurst shifter, added Hurst Classic shifter ball, fed it Mobile 1 ATF, and 3 years, 16,000 miles, still going strong. I love the way this trans goes up and down gears.
Tremec T-600 may be overkill, and substantially more expensive.
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11-13-2004, 05:15 PM
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CC Member
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Join Date: Mar 2003
Location: woodbine maryland,
md
Cobra Make, Engine: spf1973 "street" all black KCR 331
Posts: 94
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Not Ranked
tremec 600
I have a Keith Craft 331 and 3.73 rear ratio . My car is perfect with the .082
__________________
johnT
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11-13-2004, 05:21 PM
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Senior Club Cobra Member
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Join Date: Mar 2002
Location: God's country,
ME
Cobra Make, Engine: Original ERA 427sc, Powered by Gessford
Posts: 2,678
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Not Ranked
Driver-
Just checked out your gallery. Don't think I've seen an spf street version before. Very nice.
__________________
Replica is not a dirty word.
"If you can't be a good example, then you'll just have to be a horrible warning."
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11-13-2004, 05:25 PM
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CC Member
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Join Date: Mar 2003
Location: woodbine maryland,
md
Cobra Make, Engine: spf1973 "street" all black KCR 331
Posts: 94
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Not Ranked
THANKS!
__________________
johnT
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