C4 squeals on gear change and burns clutches - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 69 (permalink) Old 03-15-2019, 02:20 AM
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Re: C4 squeals on gear change and burns clutches

Either of those servos are good . I like the R's but what you have will be just fine for what you are doing. Same band adjustment on either band . Just ensure the band adjuster threads are the coarse threads ( Same thread front + rear adjusters)
If you happen to have a later case with fine thread front adjuster that's different

Last edited by gregaust; 03-17-2019 at 12:53 AM.
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post #17 of 69 (permalink) Old 03-16-2019, 07:27 PM Thread Starter
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Re: C4 squeals on gear change and burns clutches

you are all over it, yes course thread early case. my friend instructed me how to adjust the bands with an in lb tension wrench only and i have a workshop manual which shows a tool with a square drive at each end and uses an in lb wrench to do the adjustment. how do you do your adjustments using an in lb wrench? and please keep your thoughts coming as they are very appreciated
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post #18 of 69 (permalink) Old 03-17-2019, 12:43 AM
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Re: C4 squeals on gear change and burns clutches

Yes I use a Warren & Brown inlb torque wrench. I do have the correct snap-on socket with the square drive but you can do the same with a 3/8 AF 12 point socket
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post #19 of 69 (permalink) Old 03-25-2019, 08:53 PM Thread Starter
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Re: C4 squeals on gear change and burns clutches

thank you greg, i will follow your instructions and use the inlb wrench. although i havent been able to complete the gearbox i hope to have it finished this weekend which leads me to another question regarding the valve body. with the green spring in it would run off the 300 psi gauge to approximately 320 in reverse and drop to 155 - 175 in forward gears, what effect would the green spring have on the pressures if all things were "normal" ?
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post #20 of 69 (permalink) Old 04-04-2019, 02:27 AM
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Re: C4 squeals on gear change and burns clutches

Just got internet back ..

The green spring usually runs about 130-150 at cruise , 200 with load , (low vacuum) From memory reverse was 220ish ..

I know the yellow i have recorded in my notes in one i did was 203 psi in reverse
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post #21 of 69 (permalink) Old 04-04-2019, 10:39 PM Thread Starter
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Re: C4 squeals on gear change and burns clutches

cool Greg, i hope it was for upgrades anyhow the box is back in the car with your band settings and is better but unfortunately the squeal is still there. your pressure numbers are close to that of the transgo kit i believe whereas mine are 150 in forward gears and 280 in reverse down from 320. this is baffling everybody and frustrating me no end so what do think about installing a dedicated manual valve body or is there something more i can do to this valve body (steel balls, softer/harder springs, enlarged holes etc)?
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post #22 of 69 (permalink) Old 04-05-2019, 02:33 AM
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Re: C4 squeals on gear change and burns clutches

Wow , is it really the trans causing the squeal? Very unusual.. That kit usually is ok..Not really a lot else you can change..

I have used quite a few valvebodies from PTC in Melbourne . They convert yours to forward manual i guess would be the next step forward.
It is different to the transgo kit , Their mods convert to a fixed line pressure so does away with the modulator
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post #23 of 69 (permalink) Old 04-05-2019, 10:23 PM Thread Starter
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Re: C4 squeals on gear change and burns clutches

funny you say that because when i drove it yesterday the box squealed in 3rd with no gear change just on the accelerator from about 3000 rpm and i backed off. converter is the same one that i had when i built this 3 builds ago when this sound started and would not have done more than 150-200 km since. my opinion is that it is the box for one reason, the burnt parts that come out of it such as the forward clutches and high clutch were burnt when it squealed in 1st 2nd and 3rd with no band discoloration, forward clutch fixed and squealed in 2nd to 3rd change and burnt the high clutch and rear band drum. could be i am wrong, what do you think?
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post #24 of 69 (permalink) Old 04-05-2019, 10:49 PM Thread Starter
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Re: C4 squeals on gear change and burns clutches

hello again Greg, i may have a solution. while looking up ptc i found a thread on xfalcon from 2011 where you put up a picture and sizes of the holes drilled in the seperator plate C4 build Q's - Page 2 - Transmission/Driveline - xFalcon.com - X-Series Falcon Owners Club which has holes bigger than those drilled in mine with the transgo supplied drill bit. could this be the problem and if not would this be worth trying?
keep the great work rolling.
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post #25 of 69 (permalink) Old 04-05-2019, 11:48 PM
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Re: C4 squeals on gear change and burns clutches

I think you're right , burnt parts are not good .. I'm curious why the forwards would burn . If the line pressure is good , the forwards never do any work . Mostly they come out looking new .
That pic is actually one of my own valvebodies . It was an experiment I did for auto shifts behind a stroker big block..

The transgo drill is .110" That is usually plenty. I have done some to .125" but in your case all that will really do is firm the 2-3 shift.

The other hole that is drilled that transgo don't drill is a feed for the 2-3 shift valve through the 2-3 backout valve. But in that case I have blocked the 2-3 backout totally
The transgo kit that is still functional

I'm running out of ideas
I take it line pressure as you say is ok? Have you driven with a pressure gauge on it ? Does it have good line pressure rise as you accelerate and vacuum drops ? The modulator and valve and pin are all functional? Good vacuum ?
Even at idle , check pressure , then disconnect the vacuum totally, line pressure should jump up ?

The 1-2 + 2-3 shifts feel ok normal driving ?
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post #26 of 69 (permalink) Old 04-06-2019, 04:04 AM Thread Starter
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Re: C4 squeals on gear change and burns clutches

mmm so could this small hole 110" be a restriction causing less apply pressure letting the engine drive over the top of the clutches? which was my thought when i found that picture.
i havent driven it with the gauge this time and will do tomorrow, and when on the stands it went 280 reverse 150 without changing in all 3 forward gear from idle to 3500 rpm
the modulator is 3 full turns in with an extra long pin giving 2.5mm preload
vacuum is about 8 inches at idle
will check vacuum and line pressure again with modulator disconnected
the shifts feel good with normal driving, a little quicker and firmer than stock.
your help is immeasurable, so please dont stop the ideas coming
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post #27 of 69 (permalink) Old 04-06-2019, 11:41 PM Thread Starter
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Re: C4 squeals on gear change and burns clutches

i hope this helps https://youtu.be/sjK73-ulxsg
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post #28 of 69 (permalink) Old 04-07-2019, 01:30 AM Thread Starter
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Re: C4 squeals on gear change and burns clutches

and this one
post #29 of 69 (permalink) Old 04-08-2019, 01:46 AM
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Re: C4 squeals on gear change and burns clutches

Hmmm Hard to pick the sound there . Sounds to be shifting ok .
Looks like 150ish psi max? And does have line rise with vacuum drop. Did the pressure go any higher with vacuum disconnected ?
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post #30 of 69 (permalink) Old 04-08-2019, 02:29 AM Thread Starter
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Re: C4 squeals on gear change and burns clutches

hi Greg, i wasn't sure how well it would come through so thats ok. yes 150 max on the green spring and i couldn't get the, no vacuum test done. its all still set up for another run tomorrow and will post the results. can i drill those holes larger than 110" or is there a bigger problem?
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