I have an 01 grand marquis my pumpkin blew out put a new rear end in from a 01 crown Victorian out of a used police car if that matters speedometer is reading fast and tripping the computer HELP PLEAS

Asked by Nov 04, 2015 at 11:36 AM about the 2001 Mercury Grand Marquis GS

Question type: General

The speedometer is going to 107 and
Stopes there

1 Answer

74,565

The gear ratio of the rear end you installed is different that your original one. Find out what that ratio is (look for a tag on the pumpkin) and get the corresponding gear for the speedometer output on the transmission.

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