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?

Ian ONeil

Asked by Apr 19, 2015 at 01:11 PM about the 1991 Ford F-150 XLT Lariat 4WD Extended Cab LB

Question type: Maintenance & Repair

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?

1 Answer


Need to have ecm flashed for that trans.

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