Question about 1989 Ford F 250

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I have a problem with a 1989 f-250 automatic transmission diesel engine. The problem is when i take off , the transmission will not change gears unless i let off of the excelorator and when i let off the excelorator, it will change into high gear but it keeps downshifting back to low. Then it keeps changing from low to high and until i reach speed of about 45 . When im on the interstate, it will stay in drive with no problem. but city driving is very difficutl because of the changing in gears. I just want to find out what could be the problem. I was told that the low gear in transmission was probably bad. Any suggestions or help will be greatly appreciated. Thanks in advance.

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This may sound crazy to you. Check the fuse that controls the speedometer, cruise control and interior dome light. My 93 f150 battery was going dead every night. One morning I noticed the dome light inside was still on. I couldn't get it to go off so I pulled the fuse that is under the dash on the driver side. Light went out and so did speedometer. When I drove it later that day it wouldn't shift from low until I let off the gas. Then it would shift around between gears for no apparent reason. It took me a day of two to put 2 and 2 together. When I put the fuse back in, the speedometer started working and it started shifting normally. I finally took the bulb out of the dome light and now all is well.On the 93 f150 the speedometer is electronically linked to the transmission shifting points. You may have other fuses that are linked to your transmission.

Posted on Sep 12, 2010

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