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10-29-2010, 05:58 PM
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CC Member
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Join Date: May 2006
Location: Exeter,
CA
Cobra Make, Engine: KMP 498
Posts: 495
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Not Ranked
TKO Hard to Shift Into 2nd
I have aver 6K miles and it is still a push to put it into second. Has not gotten any better- maybe even worse. Any ideas? Thanks
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10-29-2010, 06:54 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Second gear only?
Is the shifter handle itself hitting on the trim ring/shifter boot/trans tunnel?
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10-30-2010, 07:44 AM
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CC Member
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Join Date: Feb 2006
Location: Scottsdale,
AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
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A long shot, but maybe look and see if the shifter is bolted tight under the boot. There should be two bolts.
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10-31-2010, 07:59 PM
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Join Date: May 2006
Location: Exeter,
CA
Cobra Make, Engine: KMP 498
Posts: 495
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Checked all that stuff. IT is something inside I think. Thanks Probably need to pull it out and see what is up. Only second.
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Sanded Aluminum Finish? Because I Can!
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11-01-2010, 05:22 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Do you have an aftermarket shifter?
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11-01-2010, 06:42 AM
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CC Member
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Join Date: Feb 2006
Location: Lake Havasu City, AZ,
AZ
Cobra Make, Engine: Arps/Burroughs/Hurricane/428FE
Posts: 1,346
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I had the same problem, hard to shift into second gear...it was hitting the tunnel. Later I broke the shifter off ....due to a crappy weld, rewelded the thing and its all good now.
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11-01-2010, 07:08 AM
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CC Member
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Join Date: May 2003
Location: Kentucky,
Ky
Cobra Make, Engine: Superformance MK III 428CJ
Posts: 72
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My 600 does not want to take 2nd if reved very high, seems like need' s syncro's, 7500 mi.?
marvin
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marvin
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11-01-2010, 09:17 AM
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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TKOs by nature will not shift easily at high rpms....
The effort needed to swap gears will get easier as the transmission breaks in, but they are not high rev transmissions unless you have some mods done.
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11-01-2010, 04:27 PM
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
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Quote:
Originally Posted by blykins
TKOs by nature will not shift easily at high rpms....
The effort needed to swap gears will get easier as the transmission breaks in, but they are not high rev transmissions unless you have some mods done.
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But aren't they marketed as road race tranny's ?
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11-01-2010, 04:30 PM
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Join Date: Dec 2001
Location: Louisville,
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Cobra Make, Engine: I'm Cobra-less!
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No...
One version of the TKO 600 is marketed with "road race" gear ratios. It's just better matched to engines with larger cams, extremely high rearend ratios, etc.
There has to be some significant work done to the TKOs for them to shift easily over 6000. We call it the "Sure Shift" upgrade. It includes disassembling the transmission, modifying the cones on the gears, installing better shift forks, different blocking rings, blueprinting endplays, etc.
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11-01-2010, 04:41 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Brent, I'm sure what you're saying is true, but the Tremec website does state "ideal for high performance racing applications."
What RPM they're limited to is not known to the public, as far as I can tell. Personally, I'm not shifting my TKO600 above 6,000 RPM, so hopefully, I don't have to worry about any shifts below that level.
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11-01-2010, 04:46 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: 22,001
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Not Ranked
I know for a fact my TKO shifts pretty darn well going from second to third at just over 6000, which is just under 70MPH. It's my favorite shift.  |
11-01-2010, 04:48 PM
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Join Date: Dec 2001
Location: Louisville,
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Cobra Make, Engine: I'm Cobra-less!
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They are certainly for high performance applications.....being able to withstand a continuous 600 lb-ft of torque. You could use them in a race car as well....but every box has its limits. Due to the machining on the gear cones, the sizes of the gears themselves (you need some big gears and larger diameter shafts to withstand that much power), and the quality of some of the other components, they just don't like the revs.
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11-01-2010, 04:57 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Had I known that there was a "Sure Shift" option when I purchased my TKO600, I'd probably have opted for it, since I think I opted for nearly everything else including the kitchen sink.
Now if I could find a nice set of magnesium wheels and an electronic EFI that works flawlessly the "first time" and "every time" and is literally plug and play, then I could check off those two options.
The SOHC being the last and final option.   |
11-01-2010, 05:12 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: 22,001
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Quote:
Originally Posted by RodKnock
Had I known that there was a "Sure Shift" option when I purchased my TKO600, I'd probably have opted for it...
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Rod, you don't need that any more than you need your TKO faceplated. Even on the heavy duty drag boards there are guys that have no mods done to their TKOs and have no problems at high shifts (granted, some do). And, tell the truth, when was the last time you shifted over 5000RPM? |
11-01-2010, 05:33 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Quote:
Originally Posted by patrickt
And, tell the truth, when was the last time you shifted over 5000RPM?
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Are you challenging my manhood?
Although I know the engine builder broke my engine in on a dyno, with everything else being brand new, I did take it easy for the first 1,000 miles. Now, being past that first 1,000 miles, I take it past 5,000 RPM as much as circumstances, time and road will allow. Thank you very much.  |
11-01-2010, 05:36 PM
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Senior Club Cobra Member
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Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
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Quote:
Originally Posted by patrickt
Rod, you don't need that any more than you need your TKO faceplated. Even on the heavy duty drag boards there are guys that have no mods done to their TKOs and have no problems at high shifts (granted, some do).
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Further, people "blueprint" their engines all the time and the "Sure Shift" option sounds essentially like the same operation, except that it's a transmission. |
11-01-2010, 05:37 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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It is, along with replacing some parts.
We also have some techniques to increase the capacity of a TKO 500 or TKO 600 by 15%. It's some cool stuff....and another reason not to buy a T-56. |
11-01-2010, 05:38 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: 22,001
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Not Ranked
I've followed the TKO high speed shift issue for years now and there doesn't seem to be a lot of rhyme or reason to it. Guys that are doing the exact same thing with the exact same trans can have completely different results. It would seem to come to down to either quality control by Tremec, or, how the transmission was originally broken in during the first thousand miles or so. The fact that you've treated your trans so gingerly, I bet it will do high speed shifts without the blink of eye. But, there's only one way to find out....
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11-01-2010, 05:40 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
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Cobra Make, Engine: I'm Cobra-less!
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Patrick, shift your trans at 6500 and see what it does.
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