Expect to see Ford casting and part numbers on all castings including: tailshaft housings, clutch pistons, ring gear hubs, governors, and more. When line pressure is too high, shifts become harsh. The C6 differs in its size and having a larger case—where bellhousing and main case are one integral casting. Also keep in mind that a re-manufactured transmission comes with a than a rebuilt transmission; three years compared to an average 90 days for a rebuilt transmission. And while I am on the subject of clutches, some transmission shops dress the steels for improved traction. Step-5: Install Torque Converter If installed incorrectly, the torque converter can cause pump and converter damage.
Although this gearing is engineered for the Modular V-8 and V-10 engines with their different torque curves, it works quite well in drag racing because vintage big-blocks offer you the acceleration advantage. Your first clue is soft or no engagement. The drain-back valve keeps the torque converter full after shutdown. This takes careful navigating to where the band-to-strut contact points fall in line with the adjustor and servo. Read casting numbers and date codes, then, check the Ford Master Parts Catalog to determine origin. First, you must establish proper throttle valve function.
On the left is a C6 forward clutch hub. The greater the intake manifold vacuum, the lower the control pressure for a sooner, softer upshift. Some 385-series and M-series C6s are finned and others are not. Instead of a low-reverse band and clutch drum, you have a low-reverse clutch locked into the transmission case. For the serious drag racer, clutches made from carbon fiber are available.
The Low-Drag Planetary gear set offers the durability and mechanical advantage of six-pinion performance instead of three each as you find in the C6. The higher the servo-apply-lever ratio, the greater the apply force. Step-6: Install Hub Install the low-reverse clutch hub, making sure roller clutch fits neatly and smoothly around the inner race. You can use a clutch spring compressor shown or C-clamps for spring compression and snap-ring installation. Torrington bearings handle friction better than those old thrust washers. Step-10: Install Bearing This Torrington thrust bearing is next.
Three ratios are available: 1. During forward clutch assembly, pay close attention to the Belleville spring condition. Step-3: Install Return Springs and Retainer Return springs and retainer are next. This one gets five clutches. Pump pressure, also known as line or control pressure, has to be controlled for proper and safe operation. When we have low intake-manifold vacuum at wideopen throttle, the throttle valve helps increase control pressure for a firm upshift, which is what you want at wide-open throttle.
In 3 rd gear, this transmission had a 1:1 ratio. Pin lengths tend to vary depending upon application and what you want the transmission to do. Step-3: Insert Belleville spring Forward clutch gets the Belleville clutch-piston return spring, also known as a disc spring. The C6 is a purely mechanical transmission that incorporates no electronics except for a very simple neutral safety switch. The transmission is very popular in the sport of drag racing today, with units equipped with manual valve bodies and transbrakes, some of which are air shifted. And this is where you are in first and second gear.
You want freedom of piston valve movement and proper spring pressures. I cannot overstress the importance of checking clutch clearances followed by an air-check on each. The close-up on the right shows how clutch frictions are internally driven. This transmission was designed and produced to be Ford-tough like no other automatic had been to date. Be careful with some applications, which have a lip seal that must be installed with the lip toward the pressure source. External Assembly Step-1: Inspect Throttle Valve The throttle valve, which is actuated by the vacuumoperated throttle valve assembly vacuum modulator. Step-11: Install Hub Carefully spline the forward clutch hub into the forward clutch.
In practice, it is quite complex and has been worked out by powertrain engineers determined to give you smooth and reliable operation for at least 100,000 miles. Make sure to lubricate all surfaces. This involves working the forward clutch back and forth until it completely seats in the reverse-high clutch drum. To increase control pressure, throttle valve adjustment needs to be turned clockwise. Selective snap-ring thicknesses to adjust clearance are.
Fluid flow begins at the pump cavity and flows into the torque converter. For special driving conditions on snow and ice, the small dot off detent starts you out in second gear, with upshift into final drive once you get going. Throttle Valve Operation Shift control is determined by both the vacuum modulator throttle valve and the kickdown linkage after the governor comes on line. The wider you can spec your band width, the better. There are two valves important to this discussion: the drain-back valve and the converter pressure-relief valve. Step-5: Inspect Pawl Inspect and assemble the parking pawl.