At that point, Ford began production of the C5 Select-Shift, which was little more than a C4 with locking torque converter and revised hydraulics for fuel efficiency. The weird thing is that it does not happen every time… when I tested it today going downhill it shifted normally at 5000ish rpms… but it seems to happen the majority of the time. A) Here you see the finished product which is a double wall vacuum connection on the problematic metal fuel vapor diaphragm. 0L small-block V-8 applications. Ideally, your C4 transmission should operate around 250 degrees F sump temperature. The C5 is not recommended for performance use. Either way, both technologies have the same function. From what I have seen, even a very small leak in the modulator line will cause more of a transmission problem before the engine starts to react. 4 Bad Transmission Vacuum Modulator Symptoms (and Replacement Cost. On the other hand, when you're driving up a hill with lots of people in your car, the load on the engine is going to be much greater. Believe it or not, the best intermediate band available for the C4 is the original Ford type because it is so durable. The most reliable automatic transmission Ford has ever produced has been the C4 Cruise-O-Matic. The trans is in a '73 302 automatic.
G) Using a razor blade or similar, trim off the excess hose to give you the length you desire for your connection and you get a nice clean edge or end to the assembly. When we talk about the load on the engine, we are referring to how hard it must work just to maintain its functionality. Don't know if the headers could be a direct cause. We have Vacuum Hose Kits to replace those old lines and recommend doing so. C4 transmission vacuum line diagram 2004 ford f 150. You probably see automatic transmissions as a convoluted maze of gears, clutches, bands, and complicated hydraulics. Ok I went to the other posts and Jim has a good the bracket kind.
You can order this part by Contacting Us. The FMX is a standalone cast-iron three-speed automatic that was in production in various forms beginning in 1950. Thought maybe you guys would know! Moving it to 1 or 2 got you a lower gear range for slower driving or towing. One full turn clockwise increases control pressure 2-3 psi. C4 transmission vacuum line diagram pdf free. The 289 high performance V-8 C4 was fitted with the popular "C" servo, which was the largest size available. Clock wise or counter clowise. Shop VACUUM DIAGRAMS. A lot of people take gear shifts in their vehicle for granted.
Just wanted to point out that Mark's advice and observations are sage, he is in the transmission business afterall! It takes patience and a feel for shift points when you're adjusting the throttle valve. C4 transmission vacuum modulator. Examine shaft surfaces for scoring during a rebuild. Our selection of steel and stainless steel lines from Classic Tube and Right Stuff Detailing are made to last—even in the harshest environments. Whenever your C4 is torn down for a complete rebuild and nose powdering, make sure it gets all new rubber parts, including the shifter shaft seals on the left-hand side.
Turn the adjustment screw in a counterclockwise direction to speed up and soften the up-shift. Processing and shipping time for this product may take longer than normal. I looked at fabis activity and he has 4 going actually over the last 2 fabi i know it's not polite to talk about you in 3rd person. TIP: Next step cannot be explained in a picture real well. Depending on what is going on...?. If the hoses are not the ones linked, and the diagram does not agree, then you have a venturi tube. It is a fiercely dependable transmission. 1) Poor Engine Performance. If this were the case then the root cause of the problem is a loose connection between the steering wheel and driver's seat. They can be adjusted ya know. This is when the transmission's clutches and bands need high application pressure for better power transfer. The intermediate band holds the reverse/high drum, while the low/reverse band holds the low/reverse drum. How to Adjust the Transmission Modulator Valve on a Ford C4. However you could use this fix on any vacuum connection on any model. So, do not automatically assume it is a bad vacuum modulator unless you are experiencing at least a couple other symptoms as well.