The Ford C6, a robust automatic transmission, gained prominence in 1968, offering durability and simplicity.
Early rebuild manuals focused on basic component replacement, reflecting the transmission’s straightforward design and widespread use in Ford vehicles.
Initial iterations catered to full-size cars and trucks, establishing the C6 as a workhorse for demanding applications, requiring detailed guides.
Historical Overview of the C6
The Ford C6 transmission debuted in 1968, quickly becoming a staple in Ford’s lineup due to its strength and relatively simple design. Early 1968 rebuild manuals reflected this simplicity, focusing on straightforward procedures for component replacement and adjustment. These initial guides were essential for mechanics tackling the transmission for the first time.
Originally designed for full-size Ford vehicles and light-duty trucks, the C6 proved remarkably adaptable. Its robust construction allowed it to handle significant power, making it popular in performance applications. The 1968 manuals detailed the specific nuances of the early C6 models, covering everything from identifying parts to proper torque specifications.
Over the years, the C6 underwent several revisions, but the core design remained consistent. Rebuild guides evolved alongside these changes, incorporating updates to address new features and improved materials. The transmission’s longevity is a testament to its initial sound engineering and the availability of comprehensive rebuild resources.
C6 Applications: Vehicles and Uses
The 1968 Ford C6 transmission found widespread use across a diverse range of Ford vehicles. It was a standard offering in full-size cars like the Galaxie and LTD, providing smooth and reliable shifting. Early rebuild manuals often included vehicle-specific notes, acknowledging slight variations in installation and componentry;
Truck applications were equally common, with the C6 powering Ford’s F-Series pickups and heavy-duty trucks. These applications demanded greater durability, and the 1968 rebuild guides emphasized the importance of inspecting and replacing wear items like clutch packs and bearings;
Beyond standard production vehicles, the C6 became a favorite among drag racers and performance enthusiasts. Its robust design allowed it to withstand the stresses of high-horsepower engines. Rebuild manuals catered to this market, detailing modifications for increased strength and performance.
Disassembly of the Ford C6 Transmission
The 1968 Ford C6 rebuild manual stresses careful component labeling during disassembly. Proper organization is crucial for a smooth reassembly process, avoiding confusion.
Identifying C6 Variants Before Disassembly
Before commencing disassembly, the 1968 Ford C6 rebuild manual emphasizes identifying the specific C6 variant. Early C6s differed significantly in case materials and internal components.
Distinguishing between cast iron and aluminum cases is paramount, as parts are generally not interchangeable. The manual details visual inspection points for case identification.
Furthermore, noting the original vehicle application is vital; a C6 from a heavy-duty truck will have different gear ratios and strengthening features compared to a passenger car version.
Checking the tailshaft housing length and spline count helps determine the transmission’s original configuration. Accurate identification prevents using incorrect parts during the rebuild, ensuring proper function and longevity. Ignoring these details can lead to significant issues post-rebuild.
Removing the Transmission from the Vehicle
The 1968 Ford C6 rebuild manual details a systematic removal process, prioritizing safety and component preservation. Begin by disconnecting the driveshaft, being mindful of fluid drainage.
Support the engine from above to prevent tilting when the transmission is removed. Disconnect all linkage, electrical connections, and the cooler lines, carefully labeling each for reassembly.
The manual stresses the importance of removing the crossmember and utilizing a transmission jack for controlled lowering. Avoid abrupt movements that could damage the transmission case or internal components.
Pay close attention to exhaust system interference, potentially requiring partial disassembly. Once lowered, inspect the bellhousing for any signs of damage. Proper removal minimizes complications during the rebuild process.
Initial Disassembly Steps: Case and Components
The 1968 Ford C6 rebuild manual guides initial disassembly, starting with external components. Drain all remaining fluid and remove the tailshaft housing, noting the orientation of any shims.
Carefully separate the bellhousing from the main case, inspecting the mating surfaces for damage or wear. Remove the pump assembly, taking care not to lose the internal check balls and springs.
The manual emphasizes meticulous labeling of all parts as they are removed, aiding in correct reassembly. Detach the manual valve, and inspect for scoring or sticking.
Proceed to remove the extension housing, and then begin separating the case halves, paying attention to alignment dowels. Document the condition of all gaskets and seals for replacement.
Internal Component Inspection
The 1968 Ford C6 rebuild manual stresses thorough inspection of all internal parts. Look for wear, cracks, and damage to gears, shafts, and the valve body assembly.
Checking the Pump for Wear
According to the 1968 Ford C6 rebuild manual, the pump is a critical component requiring meticulous inspection. Begin by examining the drive gear for chipped or worn teeth, as this directly impacts fluid pressure.
Next, carefully inspect the pump body for scoring or cracks, paying close attention to the areas where the gears mesh. A flashlight and mirror are invaluable tools for this process.
The manual emphasizes checking the pump’s internal clearances using a feeler gauge; excessive play indicates significant wear.
Finally, assess the condition of the pump’s sealing surfaces; any damage here will lead to pressure loss. Replacement is recommended if any substantial wear is detected, ensuring optimal transmission function.
Valve Body Examination and Testing
The 1968 Ford C6 rebuild manual details a thorough valve body inspection process. Start by visually checking for broken or warped components, particularly the valve plates and spools.
Carefully examine all passages for debris or obstructions, using compressed air to clear any blockages. The manual stresses the importance of cleanliness for proper hydraulic function.
A crucial test involves checking valve spool movement; they should operate smoothly within their bores without binding.
Leak-down testing is also recommended, applying air pressure to specific ports to identify internal leaks. Replacement of worn or damaged valves is vital for restoring correct shift patterns.
Gear Train Inspection: Gears, Shafts, and Bearings
The 1968 Ford C6 rebuild manual emphasizes meticulous gear train inspection. Begin by examining each gear for chipped, cracked, or worn teeth, paying close attention to the planetary gear sets.
Shafts must be checked for straightness and bearing journal condition; any signs of damage necessitate replacement. The manual details specific tolerances for shaft runout.
Bearing inspection is critical; look for pitting, spalling, or excessive play. Replace all bearings as a set to ensure balanced load distribution and prevent premature failure.
Proper gear mesh and endplay are essential; the manual provides detailed instructions and specifications for adjusting these parameters during reassembly.
Rebuilding the Ford C6 Transmission
The 1968 Ford C6 rebuild manual guides meticulous component replacement, emphasizing proper sealing techniques and precise torque specifications for optimal performance and longevity.
Replacing Seals and Gaskets
The 1968 Ford C6 rebuild manual stresses the critical importance of new seals and gaskets during a rebuild. Old seals become brittle and leak, compromising hydraulic pressure and overall transmission function.
Specifically, the manual details replacing the front and rear seals, pan gasket, valve body gasket, and various O-rings. Proper installation requires careful cleaning of mating surfaces to ensure a leak-free seal.
Lubricating new seals with assembly lube before installation is also highlighted, preventing damage during initial engagement. The manual often illustrates correct seal orientation and recommends using a gasket scraper for thorough cleaning.
Pay close attention to torque specifications for all components, as over-tightening can distort surfaces and cause leaks, while under-tightening leads to fluid seepage. A meticulous approach to sealing is paramount for a successful C6 rebuild.
Installing New Clutch Packs
The 1968 Ford C6 rebuild manual emphasizes precise installation of new clutch packs for optimal performance. Worn clutches cause slipping and poor shifting, necessitating replacement during a rebuild.
The manual details the correct order and orientation of clutch plates and steel plates within each pack. It stresses the importance of using a clutch pack compressor tool to ensure proper engagement and prevent damage.
Prior to installation, soak the new clutch plates in transmission fluid to facilitate smooth operation and extend their lifespan. The manual also highlights checking the clearances between clutch packs and reaction plates.
Proper endplay adjustment is crucial; too little endplay can cause drag, while too much leads to harsh engagement. Following the manual’s specifications guarantees reliable shifting and longevity for the rebuilt C6 transmission.
Adjusting Valve Body Hydraulics
The 1968 Ford C6 rebuild manual dedicates significant attention to valve body hydraulic adjustments, crucial for smooth and precise shifting. Incorrect adjustments lead to erratic gear changes or failure to shift at all.
The manual outlines specific procedures for setting governor pressure, modulator pressure, and manual valve detents. It emphasizes using specialized tools, like a pressure gauge, to verify correct readings.
Checking for leaks within the valve body is paramount; even minor leaks disrupt hydraulic pressure and affect performance. The manual details how to identify and address common leak points.
Proper adjustment ensures consistent line pressure throughout the transmission’s operating range. Following the manual’s detailed instructions guarantees optimal shifting characteristics and extends the life of the rebuilt C6.
Torque Converter Considerations
The 1968 Ford C6 rebuild manual stresses torque converter inspection for damage. Stall speed selection impacts performance, requiring careful matching to engine and vehicle use.
Inspecting the Torque Converter
The 1968 Ford C6 rebuild manual dedicates significant attention to torque converter evaluation. Begin by visually inspecting the housing for any physical damage, such as dents or cracks, which indicate potential internal issues. Carefully check the converter’s mounting pad for runout, utilizing a dial indicator to ensure proper alignment with the flexplate.
Internal inspection requires specialized tools and caution. Examine the turbine and impeller blades for erosion, pitting, or bending, as these defects reduce efficiency. Assess the lock-up clutch (if equipped) for signs of wear or glazing. Pay close attention to the sealing surfaces, ensuring they are smooth and free from debris. A failed torque converter can quickly damage a freshly rebuilt transmission, so thorough inspection is crucial for longevity and optimal performance.
Torque Converter Stall Speed Selection
The 1968 Ford C6 rebuild manual offers limited guidance on stall speed selection, as performance modifications were less common then. However, understanding its impact is vital. Lower stall speeds (around 2000-2200 RPM) suit street vehicles prioritizing fuel economy and smooth cruising. These converters offer quicker throttle response and reduced heat generation.
Higher stall speeds (2800-3200+ RPM) are favored for performance applications, like drag racing or towing heavy loads. They allow the engine to reach its power band before the converter begins to couple, maximizing acceleration; The manual emphasizes matching stall speed to engine characteristics and intended use. Incorrect selection can lead to poor performance, excessive heat, and premature wear. Careful consideration is key for optimal results.
Final Assembly and Testing
The 1968 Ford C6 rebuild manual stresses meticulous reassembly, verifying proper torque specifications and clearances.
Post-build testing involves checking fluid levels and shift quality, ensuring smooth operation before vehicle installation.
Reassembly Procedures and Torque Specifications
The 1968 Ford C6 rebuild manual meticulously details the reassembly sequence, emphasizing cleanliness and proper lubrication at each stage. Starting with the pump assembly, correct installation of the driven gear and aligning the case halves are crucial.
Torque specifications are paramount; the manual provides precise values for case bolts, the pump mounting bolts, and the valve body fasteners. Incorrect torque can lead to leaks or component failure. Clutch pack installation requires careful attention to snap ring placement and proper endplay.
The manual highlights the importance of using a calibrated torque wrench and following the specified tightening patterns. Final steps include installing the tailshaft housing, speedometer gear, and ensuring the transmission is properly filled with the correct fluid type before installation.
Fluid Type and Fill Level
The 1968 Ford C6 rebuild manual specifies Type F automatic transmission fluid as the only acceptable lubricant. Using alternative fluids can cause shudder, slippage, and premature wear of internal components. The manual stresses the importance of a complete fluid flush during the rebuild process to remove any contaminants.
Determining the correct fill level is critical for proper operation. The manual details a “hot fill” procedure, requiring the engine to run and the transmission shifted through all gears.
The fluid level is then checked with the engine running in Park or Neutral, depending on the vehicle application, using the dipstick. Overfilling or underfilling can negatively impact performance and longevity, so precise adherence to the manual’s instructions is essential.
Post-Rebuild Testing and Troubleshooting
The 1968 Ford C6 rebuild manual emphasizes thorough road testing after reassembly. Initial checks involve verifying proper engagement of all gears, smooth shifting, and the absence of unusual noises. A key troubleshooting section addresses common issues like slipping, harsh shifts, and fluid leaks.
The manual details diagnostic procedures, including pressure tests to assess valve body function and pump output. It also provides guidance on identifying potential causes of shudder or vibration, often linked to torque converter issues or incorrect fluid levels.
Leak detection is crucial; the manual instructs to inspect seals and gaskets carefully. Addressing these issues promptly prevents further damage and ensures long-term transmission reliability.