Speedo problems

[bigins]

i have a 2000 expedition eddie bauer edition 4.6l 2wd. i replaced the tranny with one that i got out of the junk yard cause my other one grenaded on me and now that i have the other tranny my speedo is reading like im doing 100mph when im only doing about 20mph any help or advice is needed i have been told that i need to reprogram and others have told me that i need to change out my speedo sensor if one of these is it let me know where i can fix it at or where its at

ty for all yalls help

 

[toms89]

The speed sensors are generally in the tailshaft (2wd) or transfercase if 4wd. I do not know the specifics of the 4.6 tranny but if you look around the tailshaft..maybe you can locate it?! If the speedo was ok before the swap I would say you may be able to swap out the speedo sensors and be ok. I know you can also adjust speedo calibrations in the computer but would not think this is necessary.

 

[GAINMOB]

you can always get it checked out for free from the dealership...they'll tell you whats wrong...decline for them to do the work and then come back

 

[bigins]

alright ty for the advice i live right down the road from a dealership ill take it to them as i dont have the old tranny anymore i traded it as a core and the sensor went with it not a smart move on my part i know