This is the blended-bell panfill case for full-size cars and trucks. Lubricate the thrust washer with transmission assembly lube. We offer the most comprehensive and detailed parts catalogs on the market today and produce a different catalog for each Corvette generation. And there are plenty of them out there. Identification can be determined through Ford casting numbers, date codes, and visual identification of these components. Drag racers prefer Kevlar and Blue intermediate bands because they hold and release better, and last much longer in tough racing competition.
C4 band adjustments are all coarsethread. You not only need to see that the transmission is properly filled but you also want to get an indication about the condition of the fluid. At 3 inches of vacuum, expect to see 138 to 148 pounds of line pressure in any forward gear. And this is the only phase of C4 assembly where any kind of special tool or fixture is required. Confusion abounds when mass rebuilders get pieces mixed up.
It was still a 4-speed transmission and it still had fluid and a filter that needed changing. This valve is affected or modulated by throttle position and engine load, which directly relates to intake manifold vacuum. The sun gear is held still by the intermediate band, which is locked around the reverse-high clutch drum. Cold transmission fluid gives you an erroneous pressure reading on the high side because the fluid is more dense. Kickdown valve top is depressed by the kickdown linkage at wide-open throttle. The aftermarket also provides you with larger billet-aluminum intermediate servos for improved performance. With the throttle open at 10 inches of vacuum and the transmission in any forward gear, you should see 96 to 105 pounds of line pressure.
There are no gaskets or seals here, just a snug interference fit. Kevlar bands work quite well for allout drag racing but make no sense on the street. My best advice is to go with a 1970-on transmission case and valve body rather than try to mix the two. The C servo you often hear about is for the 289 High Performance and is harder to find. Reverse was designated with a transmission ratio of 2. Step-2: Lubricate Forward Clutch Cylinder Generously lubricate the forward clutch cylinder with transmission assembly lube to ensure smooth operation on start-up. The main concern is cavity and gear condition, along with proper operation of the pressurerelief and drain-back valves.
I have a 1987 Corvette convertible with 53,000 miles. There were two C4 shift patterns employed during its production life. Is there someplace else the fluid can be leaking from? Step-21: Replace Intermediate-Band Servo Piston Seal Intermediate-band servo piston gets new seals and plenty of transmission lube to ensure proper sealing and operation. The blended-bell case is known as a pan-fill because the dipstick tube goes into the pan instead of the case. When your transmission is rebuilt everything comes out of the case and then parts are checked, replaced and everything goes back in as a stack. Step-15: Install Intermediate Band Fit the intermediate band around the reverse-high clutch drum. Always go with the best materials available for long life.
The case-fill looks like this on the righthand side, with provision for a dipstick tube. These are very solid transmissions and seldom need repair. Make sure you specify that you want a total rebuild if you have your transmission rebuilt. However, fitment is tricky to impossible in compacts and intermediates, which leaves you with case-fill only. It is easy to get the springs backward, which results in prompt transmission failure. This transmission endured a long production life, 19 years in total and 18 years in the F-150.
This rotation then causes the forward planet to rotate clockwise, only slower than the ring gear for a 2. Hard parts, such as planetaries, shafts, clutch drums, and the like, can be sourced from Transtar. This is why the R servo is more favorable than the H, if you can find one. In normal driving, the shifter should be positioned on the large green dot at the detent where the transmission does a routine 1-2-3 upshift. Make sure the O-ring is thoroughly lubricated. Also, make sure you read the dipstick properly.
Bolt Pattern Another item to watch for is five- versus six-bolt bellhousing-toengine- block bolt patterns with C4 transmissions. There are different approaches as to how to build a C4 and what to put in it. Steel thicknesses also vary, which affects clearances. Reverse Gear In reverse gear, you apply the reverse-high clutch pack and lowreverse band. Make sure that you spread it the width of the entire car and possibly three feet in front of and behind the transmission. A case in point is where the seals have started to leak and you want to postpone any real repair.