NEWB, 4wd inop - Ford Powerstroke Diesel Forum
 
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post #1 of 9 Old 04-21-2012, 01:20 PM Thread Starter
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NEWB, 4wd inop

I am new to PSD and have had this truck a month. I have had chevy and dodge diesels, but this is my first Ford. I really like the truck, but need to get the issues fixed if Im gonna keep it.

OK, on to the issue. My truck is a 99 F350 4wd with twist knob 4wd. The front driveshaft turns no mater what position the knob is in, the vacuum hoses on the hubs are dryrotted, so I engaged the factory hubs manually, then disengaged them. Neither way causes the 4wd to engage. Truck only has 478k miles.

I have looked around on the forums, but have been unable to find what I need. Thanks for your help.

I have some other issues as well, but will be posting them in the appropriate place.
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post #2 of 9 Old 04-21-2012, 01:32 PM
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Not too sure on the 4wd, since I don't have it.
I know that the hubs are vacuum controlled, so you'd have to fix those hoses to have the hubs auto engage.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #3 of 9 Old 04-21-2012, 07:24 PM Thread Starter
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Im pretty sure the factory locking hubs is a failsafe in case the air lockers fail.
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post #4 of 9 Old 04-21-2012, 07:26 PM
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I'm saying that they are vacuum operated, with a manual option. With dry rotted lines, they won't auto engage.
If the front drive shaft is turning, your 4wd should be engaged.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #5 of 9 Old 04-21-2012, 08:06 PM Thread Starter
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I understand about the auto-engage. I think the locking hubs are supposed to override the problematic vaccuum hubs, correct?
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post #6 of 9 Old 04-21-2012, 08:13 PM
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Oh, I se what you're saying. Yea, you're right.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #7 of 9 Old 04-22-2012, 06:29 PM Thread Starter
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disappointed to the amount of response. Sold the truck today. May be back, not sure.
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post #8 of 9 Old 04-22-2012, 06:58 PM
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Just happens that way sometimes.
You sold it? Hope it wasn't cause the 4wd was having issues.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #9 of 9 Old 04-22-2012, 07:10 PM Thread Starter
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NOPE, It had a few issues. I will have another PSD, just not now. I was hoping to get the issues fixed and get a lil more loot for it. Oh Well.
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