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Kirkham Motorsports

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  • 1 Post By LMH
  • 1 Post By lnfletcher

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  #1 (permalink)  
Old 06-08-2020, 06:31 AM
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Cobra Make, Engine: 65 FF. 5.0 EFI, 5 speed
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Default I need help with Tranny

Hi all,

I have a FF with a 88 Mustang GT powertrain. (5.0 EFI and 5 speed manual).

I broke 2nd gear yesterday and would like to upgrade the whole tranny. Any suggestions that would bolt up??

TIA
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  #2 (permalink)  
Old 06-08-2020, 09:50 AM
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The TKO 600 comes to mind. You do not need that heavy duty with a 5.0 engine. The TKO 500 would do, but I don't know if they can still be purchased new.

Now come the OD ratio. Go with the .82 OD. I have grown to hate the .64 in my Cobra.

You have to get the right spline and input shaft length. Not sure if the drive shaft length will need to be changed.

Last edited by olddog; 06-08-2020 at 09:53 AM..
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Old 06-08-2020, 11:39 AM
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agree the TKO 600 is good for 600 HP/600 ft pounds... You can buy it from modern Drive line. I strongly agree with the .82 (road race version) I did in my CSX.
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Old 06-08-2020, 07:01 PM
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TKO 500 should be a drop in for his 5.0 / T-5. His 5.0 is probably not making 500 foot pounds of torque. But I like the 2.97 first gear in the 600 vs 3.27 in the 500.

And I love the .64 O.D. But you have to have a cam with low end torque. More of a street motor than race motor.

We have swapped out .84 for .68 after a month or so of driving. But each to his own.
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Old 06-08-2020, 08:53 PM
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Do you currently have a T-5? Rebuild/modify it as you'll never have a better shifting transmission in there!
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Old 06-09-2020, 10:30 AM
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Is he Pre op or Post op ?
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Old 06-09-2020, 11:33 AM
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I like keeping things simple. Assuming you have a T5.

If you're planning on keeping the car, there are severeal tranny companies that beef up the T5, making it stronger, and that is what I would do. It may even be stronger than a TKO500 ?

If you are planning on getting rid of the car, I'd just swap in another stock T5
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Old 06-09-2020, 01:57 PM
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Quote:
Originally Posted by LMH View Post
Do you currently have a T-5? Rebuild/modify it as you'll never have a better shifting transmission in there!
Larry
I agree with this. The TKO is nice if you're racing, or have a lot of power. Doesn't sound like either applies to you. The TKO usually requires some different parts to install, it's bigger, and heavier. Shifting is a bit notchy.

Your 5.0 in a 2,000 pound car isn't putting out enough power to lunch a stock transmission. Yours broke because it's 35 years old! That's like 112 in human years.

Buy a rebuild kit and a new cluster and rebuild what you have. You'll end up with something better than original for 1/3 the price. If you don't want to rebuild it yourself, call Mike Forte and order a new WC T-5 and drop it in. If you want something special, call Gordon Levy and order one of his.

Personally, I would call Gordon for my next manual trans.
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Old 06-09-2020, 02:02 PM
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At first I thought this was about something entirely different.

Does anyone do rebuilds take a core credit? In the interest of minimizing downtime it might be best just to get a rebuilt and return your core for credit. After all, there is no "numbers matching" to preserve here.
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Old 06-09-2020, 08:29 PM
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Rebuild.....
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Old 06-10-2020, 08:05 AM
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Default What I was thinking

Quote:
Originally Posted by HUBBELL RACING View Post
Is he Pre op or Post op ?
LOL Means a WHOLE other thing here in Commiefornia...
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Old 06-10-2020, 09:39 AM
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I agree with Dwight, I love my .64 with 3.50 gears but I do have torque. Gives me great cruising on the interstate 2100 at a little over 70.
I never use 5th for any other roads but the interstate.
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