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Old 01-24-2006, 07:04 PM
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C4 Auto - 1965 Mustang

I need some help from someone who has some experience in setting the kickdown linkage, and also setting when the engine actually shifts (is there a way?). I'm new to working on transmissions. It's working too hard towards the end of first gear, and then it shifts (good shifts, however) at around 38-45, and it takes wayyy too long to get into 3rd, so sometimes it gets all the way up to 60 in second. Is that how it's supposed to be? I've got good control over it as it stands, but I'd like to lower the shift points, because I never drive over 65 mph in this car (I love'er too much for that!). Any help would be appreciated! Thanks guys and gals.

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Old 01-24-2006, 08:29 PM
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The vacuum modulator needs a minimum of 16" of manifold vacuum at idle for correct operation. USE A VACUUM GAUGE! Holding your finger over the hose does not measure accurate vacuum signal. Check at the modulator hose itself. Find leaks if they exist. Loose fitting rubber hose or hard hose IS a leak. If the signal is good check to see if the modulator has a small screw in the hose nipple itself. If so, screwing it out will lower shift points sometimes 5-8 MPH.
Your problem sounds like low vacuum at the modulator.
The governor might be stuck, but that usually causes no reverse in a C4...
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Old 01-24-2006, 08:43 PM
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awesome thanks for the tip. when I put my new engine in, it came disconnected (the rubber that goes to the mod valve), and I put it back in, and it shifted MUCH better (obviously) but still a little off. I'll go get a new hose after I test it. Thanks!
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Old 01-28-2006, 03:39 PM
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well I got in my car yesterday morning to go pick up my girlfriend, and my car just WOULD NOT SHIFT! It was working fine and everything was good (I tested the vaccum and it was almost perfect) and everything was working really well, and then it just stopped shifting yesterday. It ends up roaring at me when it
gets to a point where it wants to shift. What can I do? I replaced the hose that goes to the manifold and the transmission modulator, and still nothing. I made sure that my kickdown was in the right place (by the '65 shop manual's specifications)... what does kickdown do, anyways? I don't know what to do, and I don't know how to replace the valve modulator in the tranny, so could that potentially be something I should look into on how to do it?
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Old 02-27-2006, 09:59 PM
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the kickdown shifts it into a passing gear but any more than that i dont know im more of a manual trans guy
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Old 02-28-2006, 12:01 AM
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Yeah man I got it all figured out... gotta rebuild it.
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Old 02-28-2006, 08:26 AM
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The first thing I would do is change the modulator valve. Its cheap and easy to do and quite often, cures the problem.

Mark
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Old 02-28-2006, 10:15 AM
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Changed the modulator valve, changed the filter, all new fluid, adjusted the bands to spec... I think the pump is shot.

My engine rattles ALOT when stopped in Drive

There's my post in which we have been discussing my problem for awhile.
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