I need advice (c4) - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 19 (permalink) Old 06-26-2009, 04:25 PM Thread Starter
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I need advice (c4)

First off let me say this is an awesome site!! Lots of info..

My question is I have a PA supercomp c4 and Im having trouble keeping high gear clutchs in it. We have had alto blues and reds and all have only lasted around 100 miles or so. The guy that rebuilds them for me is a backyard type guy and I dont think he does all the stuff I have read about on this forum.
My car is making over 800rwhp so I was wanting to know if it was the setup or am I at the limit of the clutches in the c4. It has 6 high clutches. Thanks alot.
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post #2 of 19 (permalink) Old 06-26-2009, 10:52 PM
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Re: I need advice (c4)

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Originally Posted by klu408 View Post
First off let me say this is an awesome site!! Lots of info..

My question is I have a PA supercomp c4 and Im having trouble keeping high gear clutchs in it. We have had alto blues and reds and all have only lasted around 100 miles or so. The guy that rebuilds them for me is a backyard type guy and I dont think he does all the stuff I have read about on this forum.
My car is making over 800rwhp so I was wanting to know if it was the setup or am I at the limit of the clutches in the c4. It has 6 high clutches. Thanks alot.
You are no where near the limit of the C4. Your builder is just not experienced enough to know that it can hold more clutches than 6. What mods have been made to the valve body, case, stator, pump and servo?

66 Mustang Coupe. 365hp, 4spd Toploader, sub-frame connectors
Shelby drop, suspension tuned for slalom and hill climb
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post #3 of 19 (permalink) Old 06-26-2009, 11:13 PM Thread Starter
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Re: I need advice (c4)

I'm not sure. The valvebody is the billet one from PA and I'm not sure about the other stuff? Sorry to sound so stupid!! Is there anybody In Alabama that can make this thing work and last? Thanks
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post #4 of 19 (permalink) Old 06-26-2009, 11:42 PM
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Re: I need advice (c4)

is that a 100 miles on the road, like with -- a cop behind you? how long did the original P/A last
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post #5 of 19 (permalink) Old 06-27-2009, 05:57 AM Thread Starter
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Re: I need advice (c4)

The original one lasted along time but that when I was making 550 rwhp. Since I have changed setup and making more power is when it has been acting up.
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post #6 of 19 (permalink) Old 06-28-2009, 06:35 AM Thread Starter
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Re: I need advice (c4)

Anybody have a suggestion?
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post #7 of 19 (permalink) Old 06-28-2009, 07:25 AM
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Re: I need advice (c4)

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Anybody have a suggestion?
There is more than few people who can make suggestions but unless your tranny builder will take the advice and know what to do with it the advice may be a waste.
I would look at the pump, sealing rings on drum support, lip seals in direct clutch, end play, servo seals etc etc.
How does the tranny work, most importantly does the rpm flare on the 2-3 shift. At 800 hp that flare is a death sound.

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post #8 of 19 (permalink) Old 06-28-2009, 10:59 AM Thread Starter
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Re: I need advice (c4)

Tranny works great shifts good and firm, and no flare but it will just melt the high gear clutches and weld them together. Is there anybody in my area that is capable of building this tranny to spec.
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post #9 of 19 (permalink) Old 06-30-2009, 09:56 PM
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Re: I need advice (c4)

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Originally Posted by klu408 View Post
Tranny works great shifts good and firm, and no flare but it will just melt the high gear clutches and weld them together. Is there anybody in my area that is capable of building this tranny to spec.
You need to be running teflon sealing rings on the stator support and replace the direct clutch apply piston seals. You also probably need to run more clutches and higher pressure than the transmission was originally set up with. I would say 200 to 210 PSI. At that power level it should also be all roller thrust bearings with end play set between .004" and .006" total.

How much nitrous are you running?
blower?

66 Mustang Coupe. 365hp, 4spd Toploader, sub-frame connectors
Shelby drop, suspension tuned for slalom and hill climb
body mods and weight reduced to 2000lbs; name: Muskrat
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post #10 of 19 (permalink) Old 07-01-2009, 08:40 AM Thread Starter
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Re: I need advice (c4)

Its a 347 stroker with a 76MM turbo with 18 psi
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post #11 of 19 (permalink) Old 07-01-2009, 09:44 PM
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Re: I need advice (c4)

Klu,
What area are you in?
At 18 psi on a 347 you are getting an honest 800hp at the rear wheels so you need to have the advantage of 7 clutches in the forward pack, 6 clutches in the direct pack, teflon sealing rings, 180 - 200 psi line pressure and (I hate to say it) carbon and Kevlar linings throughout. You also need about 60000 pound (towing capacity) cooler and a host of other mods to the case, pump and stator support.
Since the C4 that you have was built for 550 HP and you have nearly doubled that now - you simply need a transmission that will work with that much power.

66 Mustang Coupe. 365hp, 4spd Toploader, sub-frame connectors
Shelby drop, suspension tuned for slalom and hill climb
body mods and weight reduced to 2000lbs; name: Muskrat
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post #12 of 19 (permalink) Old 07-02-2009, 03:58 PM Thread Starter
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Re: I need advice (c4)

I'm in Central Alabama.
I have a AC condensor thats 28x18x1 that I have just put on. I thought the tranny I have is supposed to be good for 1000hp? Thanks for the help Paul
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post #13 of 19 (permalink) Old 07-02-2009, 04:23 PM
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Re: I need advice (c4)

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Originally Posted by klu408 View Post
I'm in Central Alabama.
I have a AC condensor thats 28x18x1 that I have just put on. I thought the tranny I have is supposed to be good for 1000hp? Thanks for the help Paul
Hey! if they sold you the transmission with documentation that says it is good for 1000 HP then I would be calling the builder and having a serious conversation with them. (duly politically correct)

It does not happen often but sometimes I have to restrict the language I use.

66 Mustang Coupe. 365hp, 4spd Toploader, sub-frame connectors
Shelby drop, suspension tuned for slalom and hill climb
body mods and weight reduced to 2000lbs; name: Muskrat
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post #14 of 19 (permalink) Old 07-02-2009, 08:20 PM Thread Starter
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Re: I need advice (c4)

Well the only problem there is Im not the original owner
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post #15 of 19 (permalink) Old 07-03-2009, 03:12 PM
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Re: I need advice (c4)

oops!
Do you think you can rebuild it yourself?

66 Mustang Coupe. 365hp, 4spd Toploader, sub-frame connectors
Shelby drop, suspension tuned for slalom and hill climb
body mods and weight reduced to 2000lbs; name: Muskrat
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