4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

speedo queston

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Old 01-22-2007, 12:52 AM
  #1  
freeunit
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Default speedo queston

how far off will my speedo be with my 4.10's.. im in a automatic if that makes a difference
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Old 01-22-2007, 12:58 AM
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gt96stang
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Default RE: speedo queston

you'll want a tuner... when I did my 3.73's with my t45, I know I ended up about 10mph higher of a reading.. Meaning it said I was going 60 when I was doing 50...But it also racks up the mileage faster too, many people don't know that.
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Old 01-22-2007, 01:57 AM
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freeunit
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Default RE: speedo queston

really why would it rack up the mileage?
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Old 01-22-2007, 02:10 AM
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wisk
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Default RE: speedo queston

Yeah you'll want a tuner to correct your speedo. 4.10 will definitely run the speedo faster, and like gt96stang said, that'll just run your mileage up faster too. Why? Cause thats how milage counter works.

Just to steal the thread for a second.. for some reason today I got a wild hair to try out the digital gauges built into the factory cluster. Got to cruising down the interstate at 2000rpm in 5th gear, which with my rear tires being different than stock should equate to 75 mph. Well the digital speedo read correct, but the needle read 80mph. I didn't understand that all too well because I did correct my speedo with my predator tuner. Has anyone else had this problem?
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