I have a 1991 4X4 automatic F150 with a 1992 4X4 auto transmission in it. The speedometer won't work, but everything else does. How can I fix this?
1991 F150 4X4 Northland Edition (auto trans). Put in a 1992 4X4 F150 auto trans. Now the speedometer won't work. How can I fix this?
Need to have ecm flashed for that trans.
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