Roush 3:73 vs my Speedo

Discussion in 'Special Production' started by SKUNK160, Mar 9, 2004.

  1. My S281 has 3:55's from Saleen....so if I fit 3:73's in back how much will my Speedo be out? and what would Saleen have done to correct the speedo reading when the 3:55's went in?

    Do I need a third party correcting device like the Dallas Mustang’s SpeedCal?

    Thanks
     
  2. it needs to be recalibrated...i do not know who does them. your car will be collecting miles a bit faster then it should if you do not get it calibrated.
    Rich
     
  3. i always wondered, what did saleen do to correct for the 3.55's?
     
  4. I am not sure what Saleen does for pre ’99 cars but on all the late models, the correction is made in their flash program. I plan to move from the current 3.08s up to 3.55s. If I send my computer into Saleen, they will make the gear change for $50.
     
  5. anybody know about the pre 99 cars?