4x4 shifting by its self - Transmission Problems


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4x4 shifting by its self

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Auto Repair Home>> Automotive Repair>> Transmission Problems

Benitonavarro6
New User

Jan 3, 2013, 11:38 AM

Post #1 of 4 (2491 views)

4x4 shifting by its self	Sign In

1998, ford f150, triton 4.6, 246'000
4x4 shifts in in by its self, while driving, and some times won't shift out.
Four wheel is on the floor.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 3, 2013, 7:32 PM

Post #2 of 4 (2464 views)

Re: 4x4 shifting by its self	Sign In

Does the transfer case engage by itself or is the 4wd light coming on even though the transfer case isn't engaged?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jan 3, 2013, 7:32 PM)

Benitonavarro6
New User

Jan 3, 2013, 8:14 PM

Post #3 of 4 (2452 views)

Re: 4x4 shifting by its self	Sign In

Well the light comes on and it's engaging as well, mainley while I'm going slow.

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 3, 2013, 8:26 PM

Post #4 of 4 (2451 views)

Re: 4x4 shifting by its self	Sign In

Yours has the mechanical shift on the fly transfer case. The engagement is mechanical by the shift lever, but there is a module that controls the electromagnet clutch and the front end actuator. The module also turns on the 4wd and low lights depending on the position of the electrical switch down on the transfer case.

Do a visual of the transfer case wiring and make sure it isn't grounding out or rubbing on anything. You may need to monitor the switch inputs to be sure you don't have some sort of false input causing the module to lock the front end and turn on the electromagnetic clutch. Also inspect the shift lever linkage and make sure it isn't sloppy.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jan 3, 2013, 8:30 PM)

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