This would mean the problem's symptom was occurring before the headers and now it's not. The intermediate band servo size is critical to performance. Rebuild kits and performance parts for early C4 transmissions are becoming harder to come by. C4 Tranny concerns - Classic Cougar Maintenance Restoration and Repair. We used black over red hose here. Early on, the C4 was known as the "Dual Range" Cruise-O-Matic, also called the "Green Dot" due to its rather unconventional dual shift pattern.
Vacuum Modulator Line, Steel, V8, C-4 Transmission, Ford, Each. A good rule of thumb for transmission building is extra care. I know for a fact my motor is not making any amount of useful power at that rpm range, and frankly I do not think I want to be a regular visitor to that RPM range ever again as it sounded like the motor was not enjoying it either. We have Vacuum Hose Kits to replace those old lines and recommend doing so. Before you even get started, it's important to understand the basics that make C4s different from one another. Manual shift shaft seals are also potential leak sources. For '67, the C4 became the "Select-Shift" with a conventional P-R-N-D-2-1 shift pattern and a new valve body. C4 transmission vacuum line diagram chevy s 10. If your engine's peak torque comes on strong around 5, 500 rpm or higher, you want a torque converter that will allow the engine's revs to become higher before the torque converter begins to transfer power. When you are shopping for a torque converter, shop stall speed while you are at it. In 1970, Ford made significant improvements to the C4, including a larger input shaft, better shift programming, and a host of other changes that refined it for better driveability. Ideally, your C4 transmission should operate around 250 degrees F sump temperature. Just wanted to point out that Mark's advice and observations are sage, he is in the transmission business afterall! Always replace the torque converter.
Will also fit 289/302. A carelessly installed o-ring seal can be pinched or torn, which will cause internal leakage and, ultimately, clutch or band failure. 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. Screw-in vacuum modulator, '66-'71. One full turn clockwise increases control pressure 2-3 psi. Some are smooth while others are finned. Now you can improve its performance dramatically with new parts from B&M Racing & Performance and Mike's Transmission. Our strong recommendation is that you remove and update it with our Venturi Delete hoses. The vacuum modular is a load sensor inside of the engine which calculates how much of a load is being placed on the engine of your car. C4 transmission cases can be identified by their casting numbers, located on the left-hand side of the case. 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. 4 Bad Transmission Vacuum Modulator Symptoms (and Replacement Cost. Resurface the shaft or replace if scoring is found.
Max also earned a degree of biblical metaphysician from Trinity Seminars Ministry Academy. Some companies, such as Trans Go, still offer rebuild and performance kits for the FMX today. Shorter fitting, shorter double wall. And finally, is your throttle valve (vacuum modulator) screw-in (before '72) or press-in ('72-up)? Ford C4 Automatic Transmission - Modified Mustangs and Fords Magazine. The standard vacuum hose is a nice snug fit on all the fittings, but the metal fuel vapor diaphragm was the main reason for this remedy. In its most basic form, the C4 has room for additional clutches. Park the vehicle on a firm, flat surface. Ideally, you would use '70-up internals as a complete package whenever you opt for the larger input shaft. So for this, we are showing you a trick we recently came up with that fixes the problem, and does it in such a clean way, you may decide to do all your connections this way. The C4, C6, and FMX operate off the same basic principle of throttle valve operation.
It is about longer transmission life. Transmission Vacuum Line, Steel, Pontiac, TH400, Each. We're going to address how you can improve your C4's performance by showing you what the pros recommend for performance or just plain cruising. C4 transmission vacuum line diagram 2001 does f 150 triton v8. Six-bolt V-8 bellhousing from '65-'82. 429/460 and 351M/400M: Large six-bolt spread with two-bolt starter boss. Low manifold vacuum (open throttle) causes the throttle valve to modulate high transmission control pressure.
Max Stout began writing in 2000 and started focusing primarily on non-fiction articles in 2008. The vacuum modulator has a vacuum line which is attached to the intake valve and calculates the engine's vacuum amount. Early models were a screw-in type and later models were a push-in style that were secured with a bracket. This will ultimately affect the fuel economy and efficiency of your vehicle. C4 transmission vacuum line diagram 73 corvette. Two bands: intermediate and low-reverse. Transmission Vacuum Modulator Replacement Cost.
Bolt in front of it part of. Beginning in 1970, Ford went to a larger C4 input shaft, which changed everything from the torque converter to the forward clutch package. In 1967, Ford phased out the Dual-Range C4 Cruise-O-Matic, going to a more conventional valvebody and shifter with a P-R-N-D-2-1 shifter pattern that was easy to use. In the '80s, Ford gave the C4 a locking torque converter for greater efficiency and renamed it the C5. Used the heavy-duty MX gear train in the smaller FX case for durability. This is why racers opt for torque converters with 4, 000-rpm stall speeds.
We may even start to include it as part of the kit if this suggestion gets popular. I attached a pic of the lines. When going wide open throttle out of the hole, the car normally will shift into 2nd gear around 4800-5000 rpms at 55ish mph. Everything from the front pump seal to shift control seals get overlooked during builds. With the accelerator pressed, manifold vacuum is low. You can order this part by Contacting Us. Don't know if the headers could be a direct cause. The purchase of an aftermarket torque converter also allows you to dial in the stall speed, which gets the engine's power band more in synch with the transmission.
So after we remove it we put new one and do we do any adjustments. Once the hose is through, pull the pliers handles apart a little more to loosen up on the bolt or object. Select-Shift "P-R-N-D-2-1" for '67-'96. Right in where the vacuum hose came off. Do not use with 429/460/351M/400M. Ok I went to the other posts and Jim has a good the bracket kind. Sorry I could not be of more help. FMX intermediate and low-reverse servos are located inside the case. It was found mostly behind the 3. Changes-C4 Yourself. The modulator or is a. seperatte piece...
Not only do we want our C4 to perform well, we want it to be free from leakage. This means your early C4 Dual-Range transmission will not accommodate the B&M kits and torque converters. Hey guys… a new issue has just arose with my 69 Xr7. It is a fiercely dependable transmission. The larger 164-tooth flexplate is pictured below. Part Number: CST-MUM1003-SS. Here are the two input shaft sizes, side by side. 88-89 944TS w/Stock Intake (2 vac ports), Dual Port WG w/MBC, Venturi Delete.
Do not adjust the screw more than four turns in either direction. What is shown is yet another difference, known as flywheel size. I went out for my first test drive with the headers went WOT and nearly passed out when I saw the tachometer!
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