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transmission problem

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Old May 26, 2013 | 06:14 PM
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transmission problem

my speedometer will jump up then down then way up and then back down
 
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Old May 26, 2013 | 08:15 PM
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Year? Model? Trans?
 
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Old May 26, 2013 | 08:19 PM
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Originally Posted by Evan_P
Year? Model? Trans?
1991 ford f-150 5.0 and idk bout the trans
 
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Old May 26, 2013 | 08:30 PM
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its an auto
 
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Old May 26, 2013 | 08:56 PM
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Look at the code on the door sticker and post the code.
 
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Old May 26, 2013 | 09:27 PM
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i looked and it said Trans E
 
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Old May 26, 2013 | 10:40 PM
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I would guess bad speedometer cable or gear
 
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Old May 26, 2013 | 11:47 PM
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No speedo cable or gear on that trans. That trans is an E4OD. It is completely computer controlled. Try pulling codes to see if anything comes up.
 
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Old May 27, 2013 | 01:59 AM
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what you mean try pulling codes???
 
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Old May 27, 2013 | 02:49 AM
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Old May 27, 2013 | 03:07 AM
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my truck has a different speedometer and do i have to have any certain instrument to do all that...
 
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Old May 27, 2013 | 04:30 AM
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The OP's truck has a cable driven speedometer. So going back to a previous post the issue can be caused by a worn speedometer drive gear or cable.
 
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Old May 27, 2013 | 04:45 AM
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Woops. Had a brain fart there. Yes there is a speedo cable and gear. Check those for any wear or damage. Forgot it isn't the trans that determines it, rather the implementation of a PSOM that got rid of the cable and gear... My bad.
 
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Old May 27, 2013 | 05:07 AM
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1992 was the first year Ford combined the VSS function with the RABS sensor on the rear axle. Therefore they dreamed up the PSOM to provide signal input for the electronic speedometer/odometer.
 
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Old May 27, 2013 | 11:34 AM
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ok thats what i thought because i have wiggled the wire before my stepdad said it was loose. can i fix that myself how would i do that
 
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