The modulator is located on the back of the case above the pan. Either way, if you see the jiggle pin you know you have found a 1970+ model.ġ973+ models have a push in modulator, whereas all the earlier ones screwed in. If you happen to be looking at a transmission without a tail shaft/transfer case you can identify it as a C4 4×4 transmission by the tube coming from where the jiggle pin normally would be. It is just a basic valve that pops open when the case gets enough pressure. It stays on top of the housing by the tail shaft and vents the case. In the 1970 and later version it has something called a “jiggle pin”. So if you see that tube, you can fairly assume that you have identified an early model. It was eliminated for the 1970 model year and never returned. Pan shape is more uniform than GM automatic transmissions, but they each do have a different shape.Īs stated earlier, the 1960’s version of the transmission had a vent tube on the passenger side. They each use a different number, so there really is no confusion. The most effective way to identify which three speed Ford automatic that you are looking at is to count the number of bolts used to secure the transmission pan. The tail shaft or transfer case bolt to the C4 with six bolts. The speedometer cable is attached to the driver’s side tail shaft, if you are looking under the car, that is a good place to start. So, unless you are looking at any big block other than the 400, you can rule out the C4. The C4 was never put behind any engine that had a displacement over 400 cubic inches. The real trick is identifying which C4 you are looking at. There is not much to figuring out whether or not you are looking at a C4 transmission. This transmission lasted for only 4 years.Ĭ4 Specs Manufacturer: Ford Motor CompanyĬase Length:Different applications had different lengths due to different tail shafts/transfer cases. It also got a locking converter to help Ford meet ever tightening fuel mileage requirements. Like in 1970, it was upgraded to handle more power and increase reliability. Usually car versions had the dipstick in the case. Regardless of model year, the C4 can have a dipstick that goes directly into the pan or the case. this allows it to be custom fit to vehicles it was never intended on running in. Unlike most early transmissions, where the case is fused with the bellhousing, the C4’s is removable. It still is a pretty popular transmission with bracket racers due to its 110 pound weight. It also was used in the F150 until production ceased. The C4 was used in light duty vehicles such as the Mustang, Torino, and Falcon. These changes gave the C4 upgraded internals capable of handling more power and increased its durability. In 1970 the engineers at Ford gave it its first design changes. The transmission stayed relatively the same for its first 5 years of production. It was engineered to work with rear-wheel drive vehicles. When first released it was known as the “3 Speed Cruise-O-Matic” Like GM and the switch from Powerglide to TH350, Ford replaced the iron case of the “Ford-O-Matic” that it replaced. The C4 is a transmission that was produced by the Ford Motor Company starting in 1964.
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