Mechanics

4 WHEEL DRIVE DISENGAGE FAILURE. ELECTRON

2000 Ford Ranger

Drive Train Axles Bearings problem
2000 Ford Ranger 6 cyl Four Wheel Drive Automatic 65000 miles

My 4 wheel drive HI does not disengage normally and makes a loud " howl" when engaged.

Two wheel drive is fine.
4 wheel LO drive is disengages normally.

In 4 wheel HI (and LO) there is a loud " howling" sound like when you drive on pavement with mudder tires.

In 4 wheel HI I can turn off the switch and the light goes off. However it actually stays in 4 wheel HI, sometimes for miles sometimes for ever. When (if) it does finally come out there is a significant bump like when you drive through a pothole and the howling stops.

I can also get it to come out of 4 wheel HI by turning off the switch and then at any time after that (right away or miles later) if I make a hard turn either right or left.

If I stop and put it into neutral and turn off 4 wheel HI (like you do with 4 wheel LO), it still stays in 4 wheel HI.

I had the truck into the local Ford Dealership for 3 weeks and they were unable to fix it.

They did the following:
1. Replaced fluid pump and forks in my Xfer Case.
No fdifference.

2. Put in two (2) replacement Xfer cases.
No difference.

3. Checked the front differential.
Everything looked great and met all tolerances.

4. Put a different type of fluid in Xfer Case.

5. Gave up and refunded my money.

VIN: 1FTZR15X3YPB43732
Avatar
Bob9908
January 21, 2010.



Based on your description, the problem isn't in the transfer case but rather the front axle. Have they gone over the vacuum system to the axle. THe reason I ask is because 4 lo to 4 hi keeps it in 4wd which works fine. However, when you move to 2 hi, the axle isn't releasing. Check the vacuum hoses. Also, does it come out of 4wd if you move in reverse?

Yes, it does come out of 4WD if I stop, turn off the switch for 4WD HI and then put it into reverse, backup a couple of feet and then go forward.

If I just stop, turn off the switch for 4WD HI, put it into Neutral and then go forward it stays in 4WD HI.

It really howls in 4WD HI, especially at around 40 MPH.

I also notice that in 4WD HI it really pulls hard to the left.

2WD dives just fine: no howling and little or no pulling to the left.

Tiny
Bob9908
Jan 22, 2010.
I think you need to check the hub bearings. It sounds like something is going bad either in the hub assembly or the differential itself.