How to Install Ford C4 & C6 Transmissions: Step by Step Guide

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The year range is pretty non specific. If the truck has a vacuum hose to the transmission (to the vacuum modulator), the line will be a metal tube attached to the large tube that the transmission dipstick is in. It will come up and connect to a hose that will run to the base of the carburetor. The.

First you have Allision. This type is like the one in your personal vehicle. It does have a torque convertor. You apply the brakes and hold them down when you shift into or out of drive, neutral, and reverse. It is a simple push button system. No hard work there. The next kind that you have is Eaton Fuller automated transmissions. These are the standard transmission, but with shift solenoids where the shifter would be.

These are then split up into two types. Autoshift has a clutch that you have to use on take off and stops. Again with these you have to release the parking brake, hold down on the service brakes, select the direction that you want to go R for reverse, D for Drive, N for nuetral, and L for Low Range push the button on the selector pad and the light should light up if it is in that gear direction. If it beeps at you it means that it will not go into gear and that you are doing something that it does not like.

Reselect Neutral and try again.

Where Does the Vacuum Hose Off the Back of the Transmission Hook

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Common Problems for The Ford 5R55E Transmission: Do You Know What They Are

Variable Bleed solenoid Torque Converter Clutch: These are professional shop manuals which will give you the capability to diagnose problems, and evaluate repair options. If you decide to have your transmission overhauled at a local shop you will be armed with detailed knowledge of problems and potential fixes. This information should help you get the best deal.

Throttle Valve Cable Bracket This project was an outgrowth of my original Cruise Control Throttle Bracket. It was required when I decided to swap in a THR4 transmission in place of the TH transmission in my GMC Suburban to gain the benefits of a modern overdrive transmission.

Repair Transmission Oil Pump Before any transmission noise or vibration troubleshooting is done, the engine and drivetrain must be ruled out. Transmission oil pumps provide fluid pressure for the transmission and torque converter. The valve body regulates, controls, and directs the flow of pressurized transmission fluid. Gear and rotor-type are considered fixed displacement pumps. Most pumps today are variable displacement. This means they vary or change fluid pressure according to demands.

With a fixed displacement pump, the pressure increases with rotational speed, sometimes providing unneeded pressure. With a variable displacement pump, the pressure is allowed to decrease with lesser demand. This saves energy by decreasing output without affecting speed. Transmission pumps are driven directly from the engine through the torque converter. This causes the pump to operate whenever the engine is running.

This is why a worn or faulty pump makes a whining noise in all gears including park and neutral. A restricted or clogged transmission filter will make the same whining noise as a faulty transmission pump.

C4 Vacuum Modulator Hook

I am putting a 91 T-Bird 5. It has been years since I pulled the powertrain out of the T-Bird, so my having problems remembering some of the little things now. Does this come up on the passenger side?

The Ford C6 is a heavy-duty automatic transmission built by Ford Motor Company between and It was marketed as the “SelectShift Cruise-O-Matic”. Compared to its predecessor MX transmission, the C6 offered lower weight, less complexity, less parasitic power loss, and greater torque capacity for larger engines. It did this without exceeding the packaging dimensions of the MX.

Does it matter if I hook it up at all? Most of the other transmissions used a mechanical linkage or cable to indicate wide-open-throttle WOT. This WOT trigger achieves two things: Above a certain speed, as determined by the governor, the transmission will not downshift from third to second or second to first gear. This is to protect the transmission from damage. Instead of a linkage or cable, the TH uses an electrical switch that is most often mounted on the carburetor. When the linkage hits WOT, this completes the circuit to connect the transmission to full system voltage.

This electrical input powers up a solenoid in the transmission that accomplishes the same results, with higher line pressure and a signal to downshift the transmission. Often when a TH is swapped into a different vehicle, this downshift electrical switch is overlooked. Besides the loss of any kind of downshift function, the real danger is that under WOT the transmission has not been commanded to increase line pressure. This causes not only a soft upshift, but also damage to the clutches because the lower line pressure increases the potential for slippage on upshifts.

There are several ways to solve this problem.

R4 Transmission Swap

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Here are the basic four and a brief description of each. This is a tank or other container that holds the fluid to supply the rest of the system.

A hydrostatic transmission works like an automatic transmission, but uses fluid rather than belts to transfer power from the engine to the wheels. This transmission offers a smoother ride, requires less maintenance and lasts longer.

This page started life as a small section on my GMC Suburban page, but quickly took on a life of it’s own. This was the final problem I had to solve so I could complete the installation of the new TH R4 transmission and hook up the throttle valve TV cable to the carburetor linkage. What is a TV cable? The TV cable goes between the throttle linkage on the carb and down to the transmission to control the overall pressure inside the transmission which in turn drives shift firmness and various other details.

It is how the transmission knows how much throttle you are giving the engine so that the transmission can do the right thing. Do not make the mistake of thinking the TV cable is just a simple kickdown cable as used on other transmissions! They are a critical and precision piece that must be properly hooked up properly. The transmission is calibrated to work with the TV cable working a certain way, and it is very precise. Getting this installed and adjusted correctly will be one of the single most important steps to completing my transmission swap.

Background and Research I currently run a Holley carb with a custom throttle linkage bracket so I can hookup my cruise control, and the only TV cable bracket I could find for a Holley carb did not have a provision for a cruise control cable. To complete this swap, I had to figure out how to add a TV cable hookup to things, and it would involve some custom bracket fabrication. I first found out that I needed a bracket to mount on the carb linkage to hook the TV cable up to – the original Holley carb linkage was designed for use with various kickdown linkages and cables, and the geometry was not correct for the TV cable.

TCI makes a “Cable Geometry Corrector” Jeg’s part for Holley carbs, part for Edelbrock carbs that does exactly this and it’s a simple bolt-on part.

Transmission to Engine Install – LQ4 and T56