2003 Mustang Gt Slow In 3rd Gear

Discussion in 'SN95 4.6L Mustang Tech' started by austin96, Dec 6, 2017.

  1. 2003 Mustang GT 5-Speed. The car pulls really hard in 1st and 2nd but it as soon as I shift to 3rd gear it just falls on its face. Is this a common thing with these motors? Would a tune remedy this?
  2. What modifications have been done?
  3. Nothing too crazy. Bbk off-road x pipe, MSD coil packs, cold air intake, 3.73 gears, flowmaster 40s
  4. I'm wondering this too. I'm thinking the speedo/ECU recalibration/"tune" will fix the issue. Unless the horsepower just isnt there to go with the torque.
  5. I'm hoping so. The previous owner installed the 3.73 gears but didn't get a tuner to correct the speedo. I should have enough saved up for a tuner soon so hopefully that fixes it. I think I have a slight exhaust leak at the passenger manifold to midpipe flange, could that be part of it?