2003 Mustang Gt Slow In 3rd Gear

austin96

New Member
Sep 27, 2017
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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?
 
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austin96

New Member
Sep 27, 2017
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Nothing too crazy. Bbk off-road x pipe, MSD coil packs, cold air intake, 3.73 gears, flowmaster 40s
 

98Mustang2017

Active Member
May 3, 2017
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.. 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?
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.
 

austin96

New Member
Sep 27, 2017
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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?
 

mogs01gt

Founding Member
Jul 22, 2002
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Could you provide details regarding "falls on its face". Are the RPMs climbing slower, hesitating etc etc.? Stock 4.6's do not make a lot of power but should pull 3rd gear to over 100mph.
 

98Mustang2017

Active Member
May 3, 2017
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While we are back to life i might as well say what my issue was:
4.56 gears ! lol
Stock tires + 4.56 gear = spin 1st , second, and sometimes the beginning of third if i dont shift into gear fast enough when in clutch. I topped out at 68mph until i removed my Speed Sensor then i was able to hit 98mph (only in a manual trans car can do this) .

(added to post):
The reason it SEEMED slow in third gear was because i shifted into third so quickly. When it finally gained traction i was really suppose to be in 2nd gear.

So when i finally gain traction in third i should shift back down to second. Shifting with wheel torque is an art for sure.
 
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