Trouble with 4 low

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Dec 30, 2004 | 06:51 AM

Duksrule

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Tuned

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From: Va Beach Va

Trouble with 4 low

I have an 03 SD CC 6.0 with the electric 4X4 switch. I have noticed lately that it seems to only go into 4 Low when it wants to. I have the truck in N and 4 hi then hit the switch for 4 low and sometimes it goes and sometimes it doesn't. Also a few times I had trouble getting it out of 4 low.

Any simple fixes for said problem?

Dec 30, 2004 | 07:52 AM

Frobozz

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Trans in N. Foot on brake. Truck not moving. Flip the switch, wait a few seconds, and it should go in or out of 4Lo. If not, put it in gear, move the vehicle a foot, repeat the above.

If *that* doesn't work, something's broken. There are little motors on the transfer case to make the switch, and it's possible you have one that's on its way out. (But that's pretty rare; usually it's the hubs that have problems on the ESOF system!)

Duncan

Dec 30, 2004 | 08:20 AM

Duksrule

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From: Va Beach Va

I think that may be it. I can't swear that I put my foot on the brake. I will check this and see if it cures my issue.

Edit:
That was it. I didn't realize there was an interlock between the brake pedal and the 4Low switch.

Last edited by Duksrule; Dec 30, 2004 at 08:24 AM.

Dec 30, 2004 | 09:16 AM

Frobozz

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Quote:

Originally Posted by Duksrule

That was it. I didn't realize there was an interlock between the brake pedal and the 4Low switch.

I think the reasoning is that they don't want you moving when all those big straight-cut teeth mesh, at what could be fairly mismatched speeds even at slow ground speeds. (Anyone who's ever driven an ancient 4WD vehicle, like the 1960 Land Rover I used to have, knows exactly how awful it sounds when you do that!) Foot on brake = no moving!

Duncan