C4 Operation In order to best understand how to build a C4, you must first know how it operates. Tailshaft is splined into the reverse ring gear hub. However, the eight-bolt valve body does not work with the nine-bolt 1970-on case. Step-20: Replace Low-Reverse Servo Cover Seal Low-reverse servo cover gets a new seal, which should be lubed with transmission assembly lube. Before installing the converter, pour at least 1 quart of transmission fluid into the converter to help prime the system for generous lubrication and pressure on start-up.
In no way does Wiring Diagram Pictures claim ownership or responsibility for such items, and you should seek legal consent for any use of such materials from its owner. If all else fails, one of the best sources is Transtar for new parts. If they are not, a governor test can be performed either in the shop or on the road to determine if the governor is functioning. Always replace the bushing and seal. 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. Each manual is 100% dedicated to a specific transmission model.
The C4 transmission employs a conventional fluid coupling known as a torque converter. On the right is the parking-pawl mechanism rod and detent spring. First Gear Because the reverse planet is held stationary by the one-way roller clutch and reverse band, the output shaft ring gear then rotates around the reverse planet pinions. Does engine misfire or bog down under load? Step-3: Apply Yoke Seal Apply a thin film of Permatex Form-Agasket non-hardening yoke seal to the tailshaft. The reverse-high clutch assembly does not have to involve special tools.
This is old technology, but still a very effective sealer. This means the ninebolt 1970-on valve body works with the 1964—1969 eight-bolt C4 case with the added bolt and a locknut. Covers transmission assembly, dis-assembly, diagnosis, troubleshooting, and electronic controls and operation. But Teflon is more appropriate for racing applications, though there are bound to be arguments on this one. The governor is still doing its job, the clutch circuit is hydraulically tight, and the 2-3 shift valve is free. The main consideration is to make sure you have a bellhousing and flexplate that match.
There are four or five clutch frictions in a stock C4 V-8 forward clutch. Steel thicknesses also vary, which affects clearances. Best servos are H or R types for full-size Fords and trucks, which are the largest and provide the greatest apply area for better band hook up. You get what you pay for. From 1964 to 1969, the C4 had a. Note: There have been many engineering changes in this transmission since its introduction. Reliability comes from a firm shift instead of a soft shift, where slippage and friction burning occur.
A C6 is easily identified by its one-piece bellhousing and main case design. Step-6: Install Governor Distributor Governor distributor is installed next, gently tapping it into place. When I ask transmission builders what they think of C4 versus C5 main cases, most take the C5 over the C4 when possible due to improved hydraulic circuitry and cooling. C5 corvette drivetrain diagram wiring diagram third level c5 corvette drivetrain diagram pleted wiring diagrams c4 transmission parts diagram c5 corvette drivetrain diagram. Be prepared for engineering changes like this in your C4. With this turn of events, power flows through the forward clutch to the front planetary-ring gear hub, which is tied to the output shaft. Covers transmission assembly, dis-assembly, diagnosis, and troubleshooting.
One thing you want to be prepared for is small changes that happened in C4 production, such as low-reverse clutch-return spring design. Without increasing the throttle setting, check for the 2-3 upshift at specified speed. As the C4 evolved, other design changes were introduced. One full rotation of the input shaft equals one full rotation of the output shaft. In few places is this more true than clutches and bands.
The low-reverse drum is locked by the low-reverse band, which keeps the rear planet carrier from turning. At this point, power is flowing through the front planet carrier to the output shaft for a gear reduction of 1. Building the C4 Although automatic transmissions can be very intimidating, they really are engineering marvels that have only gotten better with time and improved engineering. During geartrain assembly, it is easy to get lost in the details. Some applications have three frictions.