Question about 2001 Ford F150 Styleside SuperCrew

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1990 ford f150 won't shift into overdrive and has constant high whining sound while in motion. Problem came on suddenly 2 days ago. Recently I changed rear drive u-joints and muffler, should be no connection there and had transmission fluid and filter changed yesterday. A few weeks ago transfer case was low on fluid and I filled it and replaced rear output seal from transfer case. I had mechanic to do quick check on differential for excessive slop at the wheels but he said it was fine.

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Sounds like your front hubs are staying engaged, lots of problems with them on Fords, there should be a vacumm solenoid next to the battery, follow the lines down to the wheels and check for leaks. If you have a vacuum guage you can plug the line at 1 wheel and connect the guage to the other when the 4wd switch is placed from 2wd to 4wd h there should be a vacuum signal there i believe its like 12 to 15 hg and when you go back to 2wd its like 6 hg on the guage. If that dont work suspect the solenoid they are prone to water intrusion. if the vacuum signals are correct suspect on of the hubs has a vacuum leak, you need a hand held vacuum pump to test them, connect it to the vacuum port and pull a vacuum it should hold 15 hg for at least a minute, i think the actual bleed down rate is 5 hg per minute per Ford. If the hubs are leaking its a bit of work but not impossible, much cheaper to do yourself than at a shop.

Posted on Jun 19, 2009

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