front u-joint engages - Ford Powerstroke Diesel Forum
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Old 09-20-2012, 10:14 AM
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front u-joint engages

I have a 2001 F-250 7.3 diesel, 6 inch lift running LT315/75/16 for wheels. The problem I am having is when making a gradual left hand turn the driver front u-joint engages and I get a horrible front wobble in the steering and tires. It usually works it way out in about 200 yards of straight driving. But the last time I got under the truck turned the front drive shaft and the passenger side u-joint turned okay but when I wedged a wrench in the front passenger side so it could not turn the drivers side would not turn at all. I put it in four wheel drive and then took it out and everything turned just fine. Drive down the road 1/2 mile and the drivers side u-joint "engages" again. I have replaced the front steering stabilizer and just replaced the front automatic lockouts (they were very stiff and barely turned at all) with Warn manual and still the same problem. The front wobble is probably because it is only in 1/2 four wheel drive. The whole front end has been replaced to include ball joints, bearings, tierods, about 10000 miles ago. I had it to three different mechanics and still no luck. Any ideas? Sorry for the long thread.
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Old 09-20-2012, 01:39 PM
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have you replaced the u joints, a ujoint dosnt " engage" ????
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Old 09-22-2012, 07:20 AM
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I have not replaced them yet but they have been replaced about 20,000 miles ago by the previous owner. What I meant by engaged if the wobble is there and I have somebody watch as I drive slowly the front drivers u-joint it will actually rotate as if in 4 wheel drive. The passenger side will not rotate and the hubs are not locked in.
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Old 09-22-2012, 09:01 AM
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Simple check to see if the u-joint is seized is raise the tires off the ground, have the steering turned all the way to one side, manually lock the hub (one at a time) and spin the tire. Make sure you spin the tire before locking the hub and confirm there is no binding caused by other issues.

Other things to look at are the hubs and stub-shaft needle bearings.
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