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post #1 of 2 (permalink) Old 09-28-10, 06:46 PM Thread Starter
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Can I Disconnect my AWD on 00 Expedition?

I am having a problem with the AWD, it seems to slip and engage hard with a bang and the vehicle pulls hard right. It only happens under a load when I take off from a stop, or going uphill when it downshifts.

I have looked for broken vacuum lines or wires and have not found anything, I simply unplugged the harness under the drivers seat on the transfer case and it shifts and drives fine in 2WD (4x4 lite on dash flashing).

I dont care about having AWD but winter is coming and I would like to maybe leave the switch on 4HI and install a toggle switch inline so that I can just turn the transfer case on and off. Does this seem possible? Or, I would like to fix the problem if possible, I dont have alot of money to take it in and get diagnosed but could it be the shift motor on the T-Case?

Thanks in advance for any help!
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post #2 of 2 (permalink) Old 09-30-10, 08:39 PM
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Re: Can I Disconnect my AWD on 00 Expedition?

One easy fix is to leave it in AWD. If anything it sounds like the TCCM (transfer case control module, located behind dash) is acting up, as it is responsible for changing the drive mode in the transfer case.

You won't see any mileage benefit between 2wd and AWD, as the front axle is still turning, the transfer case just doesn't have the front axle engaged.

You cannot leave it in 4HI as you'll bind the axles together making turns on any hard surface, and worst case is you'll grenade the front, or rear (if not both) differentials.

If you don't want to spend the cash to get the problem properly diagnosed, and with winter coming, leave it in AWD (NOT 4HI!) and you'll be fine.

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