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4 Wheel Drive (not so much)

Tiny
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99 Explorer sport with the sohc 4.0
The shift motor on my transfer case was bad.I changed it. Now the transfer case will go into 4wheel low. But really the back tires are getting power, not the front. The shifting in and out of four wheel low was noisy @ first, then I changed the transfer case fluid and it was quiet shifting. There is no power to the front wheels @ all in any 4 wheel setting.
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Sunday, January 29th, 2006 AT 8:40 AM

11 Replies

Tiny
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Check the front hubs
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Sunday, January 29th, 2006 AT 5:54 PM
Tiny
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I put the car on a lift and the axles spin with the wheels so I think the hubs are good. I don't hear any noise from the transfer case but that seems to be where the problem is. Are there maybe any electronic sensors inside the transfer case that will not allow the four wheel drive engage?
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Sunday, January 29th, 2006 AT 6:26 PM
Tiny
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How about the switch on the dash that you use to make the switch from 2wd to 4wd high & low?
I don't know of any switches internally.
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Sunday, January 29th, 2006 AT 6:59 PM
Tiny
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The dash switch operates the electronic shift motor fine. I am starting to lean twards the chain or planetary gears inside the transfer case being bad. Wouldn't that be quite loud? I don't know how long the four wheel drive has been out.I just got the car. Any way to tell witout dropping the transfer case?
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Sunday, January 29th, 2006 AT 9:59 PM
Tiny
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Would have thought you may have found some indication of metal breakage when the fluid was removed.
Problem with transmissions and transfer cases is unless you know them first hand they are labor intensive.
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Monday, January 30th, 2006 AT 7:12 AM
Tiny
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The chains are pretty near impossible to break. And if the planetary gears were messed up at all it wouldn't spin the front axes (as per your previous post). Do you have manual or auto matic hubs on the fron end?
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Monday, January 30th, 2006 AT 8:31 AM
Tiny
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I'm going to suggest you place the vehicle in 4wd and place on a lift which I believe you have already done. It gets sticky here because you need to have vehicle started in order to perform this test.
Once transfer case is shifted into four wheel check to see if the engagement is transfering from the trans to the front differential if it's not at least you have an idea where to begin. It could be the output shaft from the transfer case to the trans. If engagement is not transferred to the front wheels you may also have a shear pin on one of your primary gears that has sheared or a spine yoke that mahve given way.
The simple tests above will give you some idea as where to start to identify extent of any repair needed.
Hope this helps you.
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Monday, January 30th, 2006 AT 9:40 AM
Tiny
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Very Helpful, I am not too keen on the four wheel drive systems. But with pro advise and the internet (may even crack a book or two), it looks like I'll be quite the expert before this is fixed. Are the shear pins internal?
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Monday, January 30th, 2006 AT 1:10 PM
Tiny
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To clarify that question, The shear pins and spline yoke are internal in the transfer case or tranny?
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Monday, January 30th, 2006 AT 1:12 PM
Tiny
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Yoke should be external. Shear pin internal.
There are a couple of different transfer cases that were installed in those vehicles.
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Monday, January 30th, 2006 AT 2:03 PM
Tiny
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Exploder cracking a book would be a wise thing with any drivetrain work.
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Monday, January 30th, 2006 AT 2:37 PM

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