Tailshaft retention C-clip is already installed. Because the low-reverse band doesn’t get the kind of workout the intermediate band does, I’m not concerned with making changes here because it has absolutely no real effect on performance. Spring lip must point toward the outside of the case at the roller and toward the inside opposite the roller. The C5 transmission case looks identical to the C4 case and can be used for a C4 buildup. To adjust the throttle valve properly, you’ve have to know the control pressure, which involves a pressur gauge at the control pressure port just above the manual shift and neutral safety switch. From 1964 to 1966 came the Green Dot Dual-Range shift pattern transmission. Like GM’s Powerglide and Turbo- Hydramatic 350, and Chrysler’s 904 Torqueflite, Ford’s C4 is a simple light-duty transmission you can knock down and rebuild in your home workshop. The input shell’s sun gear fits into the reverse planet carrier. It’s easy to get gear installation backward, where torque converter flats won’t engage driven gear flats. You can see that the roller clutch outer race has already been installed. When vacuum is low (throttle open), this valve signals shift valves to delay upshift and the main pressure regulator to increase control pressure while the vehicle is under acceleration. This is why this valve is so important to proper function. The control pressure regulator keeps pressure safe by venting fluid back to the sump, which is a normal part of operation. I promise you that the next transmission I have to replace or any other person I hear of needing a transmission I will be heavily promoting Monster Transmission and tell them that I personally use Monster Transmission. It’s very hard to find a 26/26-spline shaft if you’re building a 1970 core and need an input shaft. Beginning in 1967, Ford went to a more conventional P-R-ND- 2-1 shift pattern for the C4. This rotation then causes the forward planet to rotate clockwise, only slower than the ring gear for a 2.46:1 ratio (2.46 revolutions to 1 revolution of the output shaft). In reverse gear, you apply the reverse-high clutch pack and lowreverse band. This means you are limited to the stepped-bell, case-fill C4 for your less-than-large Ford. Experts and racers generally believe the blended pan-fill C4 case is the strongest C4 case; however, it faces space limitations with subcompact, compact, and intermediate Fords. There is no gear activity in direct or final drive for a 1.00:1 ratio. Although this intermediate band is dry, soak it prior to installing it. If it comes out around the edges, you’re using too much. Some C4 and C5 applications have an O-ring instead of a gasket. Be careful with this one—it is a wider C5 locking torque converter bellhousing, which is wider to accommodate a wider converter. Do this with the forward clutch mated to the front pump/stator support assembly. During geartrain assembly, it is easy to get lost in the details. The C5 transmission case looks identical to the C4 case and can be used for a C4 buildup. Working with the valve body is the C4’s throttle valve, also known as the vacuum modulator. Kickdown valve (top) is depressed by the kickdown linkage at wide-open throttle. Your C4’s greatest asset isn’t always the parts, but the assembly technique practiced during build-up. Confusion abounds when mass rebuilders get pieces mixed up. But with the right combination of parts, a stepped-bell, case-fill C4 offers convenience and is capable of staying together at more than 600 hp. Early in production, Ford used 10 low-reverse clutch return springs. It shifts wonderful and I'm delighted to have been dealing with Monster Transmission. Trans-Go, B&M, and TCI Automotive offer shift improvement kits for the C4 that not only firm up shifts, they also add longevity because they reduce and eliminate clutch and band slippage. Ford says one full turn either way adjusts line pressure 2 to 3 psi. Low-reverse servo cover gets a new seal, which should be lubed with transmission assembly lube.

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