If you want to upgrade your Dual Range C4 to the conventional '67-'69 pattern, all you have to do is swap the valve body. Get rid of the modulator altogether. I put teflon tape on the threads and used the little paper gasket it came with. You can adjust the modulator with the proper tools, equipment and basic mechanical knowledge. I recently added this spring, and drilled out my secondary valve, and it will change you full throttle upshifts.
Keywords for C4 Vacuum Modulator :. Shifter detent is another issue to watch for. Like the and systems, the transmission requires a number of hoses and lines that safely transfer fluid from point A to point B, including the transmission cooler lines. I need to know for sure where the vacuum line for my C-4 tranny is supposed to be hooked up. Over time, modulators can develop leaks, suffer ruptured diaphragms, become bent, etc. You may unsubscribe via the link found at the bottom of every email.
Im about to go buy one and switch it out but i need to get this cleared up first. Last time I was under there last weekend , I noticed there was fluid around the modulator. If you have already adjusted the modulator more than 3 turns then when you replace the oin - replace the modulator too. The strenght of the vaccum tells the transmission how fast the engine is spinning, and the transmission uses this information in conjunction with the speed of the governer valve to determine when to shift the transmission. The C4 automatic transmission was introduced by Ford in 1964. About the Author Max Stout began writing in 2000 and started focusing primarily on non-fiction articles in 2008. Because the C5 has a wider bellhousing to accommodate a locking torque converter, it will not fit in the tunnel of your classic Mustang.
Manual shift shaft seals are also potential leak sources. An all-new design, the lightweight C6 employed a lot of the same features as the C4. Remove the rubber hose from the modulator nipple by pulling it straight back by hand. I know this is old but I have a question. A manual shift and non-decompress auto tranny is a real kick on the street. All that does is tear parts up. Adjustments to the modulator will only mildly affect your shift points.
C4 Vacuum Modulator ~ thanks for visiting our site, this is images about c4 vacuum modulator posted by Maria Nieto in C4 category on Feb 17, 2019. Paul I try and keep the car as stock as possible, car is very original. However, service replacements are adjustable. Can manual shift when I want or just let the c4 do it thing. For '70, Ford changed the C4's main case and valve body to an eight-bolt pattern. If you want to downshift before the tranny does then pull on the shifter. DavidH25 answered 5 years ago Ok.
Thanks DavidH25 answered 5 years ago Hi fellas. In no way does imageresizertool. Adjusting the modulator clockwise firms and delays the upshift, while counterclockwise speeds up and softens the upshifts. It is a fiercely dependable transmission. Ever since day 1 I've had it hooked up to the carburetor. I know the modulator will alter your shift points, and firmness.
When the diaphragm senses changes in engine vacuum because of load changes, the diaphragm pushes against the valve while the calibrated spring moves against the movement of the diaphragm. Fabi: does yours look like this? The kickdown arm is mounted on the side of the transmission where the shift linkage attaches and where the neutral start switch is , and is a mechanically controlled device. And finally, is your throttle valve vacuum modulator screw-in before '72 or press-in '72-up? That will do the same thing. Note that passwords are case-sensitive. For the life of me I cannot get a leak from around the vacuum modulator on my C4 tranny to stop. ©Copyright 2019 by Mustangs Unlimited, Inc. What I did was at least get the shifts close to 6000 rpm's.
The limit of adjustment on the modulator without hurting the tranny is 4 turns in either direction from the center point. If you would like, youre able to promote this article to your friend, loved ones, neighborhood, or you can also bookmark this page. This is the way the C4 remained until production ended in 1982. The c4 are built to shift pretty quickly from 1st to 2nd. In fact, original factory-installed throttle valves cannot be adjusted. Check the fluid level hot. You might as well just disconnect the vacuum hose to the modulator.