How does vacuum 4×4 work?

The vacuum motor, which is mounted on the right side of the differential, moves an axle clutch gear that engages the right-side axle to the differential. The motor diaphragm uses two vacuum hoses—one to pull and the other to push—each controlled by a separate solenoid that’s commanded by the GEM.

How do you use a 4×4 Posi Lock?

WARNING Don’t be fooled!

Relax the throttle – no acceleration or deceleration.
Shift the transfer case to desired 4×4 mode.
Press the button and pull the cable into full engaged position. (Light on-off throttle action will help align gears for smooth engagement.)
Release the button.

What is a Posi Lock?

Posi-Lock – The Connector of Choice for OEM & Military Use. Our electrical connectors require no crimping. Connectors simpily hand tighten. An electrical connector that meets the needs of todays OEM’s, and is so good, it’s reusable. Truly a connector for the 21st century.

How does a vacuum motor work in a Ford 4×4?

Rather than locking the halfshafts to the wheels, Ford uses a vacuum motor to lock the shafts to the front differential. The vacuum motor, which is mounted on the right side of the differential, moves an axle clutch gear that engages the right-side axle to the differential.

What happens when the PVH hub breaks on a Ford 4×4?

The PVH hub uses a plastic retainer ring with a steel circlip that secures the axle in place in relation to the hub seal. When this ring breaks, and they do, the axle will move toward the front differential, and the sealing surface on the axle will lose contact with the main vacuum seal. This is the beginning of the end.

How do you disconnect a 4×4 axle in a truck?

The way I do it: Put the truck in neutral, and pull the transfercase lever into 4×4. Then twist the Posi-lok knob while slowly turing the steering wheel back and forth, this will allow the axle shafts to align and you can feel it lock into 4×4. Summary: I love this kit, one of my favorite upgrades I have done to my truck.

How to monitor the 4WD vacuum control solenoid?

You can monitor the 4WD vacuum control solenoid and the 2WD solenoid status by viewing the 4WDSOL and 2WDSOL PIDs in the GEM. The solenoids also can be commanded to engage the front differential using the AXLE ENGG PID or to disengage it using the AXLE DSCN PID.

How does vacuum 4X4 work?

Where are the vacuum lines on a YJ?

They are coded red, green, yellow and blue. These vacuum lines pass under the battery, on the passenger side, and appear to go to the front axel shift motor. Close to the front passenger wheel (still inside the engine compartment) these four lines have splices in them.

Where are the red and blue lines on the YJ front axle?

The yellow and green line are spliced color to color and are connected to the front axel shift motor. The red and blue lines are disconnected at the splices. The problem is, there isn’t a red and blue line connecting to the shift motor. There is instead another yellow line and a black one.

How to check the front axle disconnect system?

The vacuum lines for the 4wd axle disconnect system always seem to get unhooked, melted, or ripped totally off. Here is a way to check to see if everything is hooked up right, and if it isn’t, how to hook it up the right way. On top of your transfer case will be four nozzles that control your front disconnect system for your 4wheel drive.

Where are the vacuum lines on a 1987 Jeep Wrangler?

I recently bought a 1987 Jeep Wrangler with a 4.2 liter 6. Comming from the transmission, there are four color coded hard plastic vacuum lines. They are coded red, green, yellow and blue. These vacuum lines pass under the battery, on the passenger side, and appear to go to the front axel shift motor.

How to replace a vacuum line on a F150 FX4?

But just about 20 mins. started from right side removing in old line then replacing with the new at each joint / anchor point These were a perfect fit on my 2006 F150 FX4. Replaced the lines and reservoir cause my system wouldn’t hold vacuum pressure anymore. Problem solved. Not perfect fit but still a good replacement for the old lines.