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Speedometer Re-cal. Question.
I have a 97 e-350 SD van which was gas and now has a 2002 7.3 transplant. My speedo is 15 mph slow. Showing 60 at 75 mph actual. I have been searching and and still not quite clear.
I took it to the ford dealer and they said it was within 4mph and when I drove it there was no difference, Lol
So my question is can it be done thru the abs module with the auto enginuity alone? Or do you have to go into the PCM also. My tire is a 265/75/16 and stock is 245/75/16 so how can I be so far off. I have 3.55 rear and maby the donor had 4.10 is what I'm thinking ?? Is this affecting all my shift points? If you just let off the petal at 50mph the trany disengauges untill it hits 35mph on the speedo then engauges again like engine braking but I'm really going about 45mph....