2001 mustang gt coupe gear change
09-09-2014, 09:58 AM
#14
Join Date: Aug 2014
Location: Florida
Posts: 23
The gears should have the ratio stamped into the ring gear someplace that you can read with the cover off. If not you can lift the rear of the vehical, make a mark on the inside of the rear wheel, then rotate it 1 full turn counting the number of revolutions the drive shaft makes. So if the gears are 3.73 the drive shaft would rotate just a tiny bit under 3 3/4 turns.
3.27 gears the drive shaft would rotate just a tiny bit over 3 1/4 turns per 1 revolution of the tire.
3.27 gears the drive shaft would rotate just a tiny bit over 3 1/4 turns per 1 revolution of the tire.
09-09-2014, 02:08 PM
#15
5th Gear Member
Join Date: Jul 2012
Location: ohio
Posts: 3,628
They typically don't change the ID tag on the differential when they do a gear change. Heck I have never known for it to be changed. Nor have I ever installed a set of gears that came with a new ID tag.
In order to know what gears you have you must visually verify them , or count the number of drive shaft rotations per 1 rotation of the tire.
Changing tire size can also affect the speedometer reading. Going to a larger or smaller diameter than what came from the factory.
Also thinking about it , the gear ratio is often stamped into the inside end of the pinion gear.
09-09-2014, 07:14 PM
#16
2nd Gear Member
Thread Starter
Join Date: Nov 2013
Location: ga
Posts: 273
got the gear installed for 450.00 parts and labor love it! now just waiting on my tuner to get here thursday. so i can tune it for new gear setup
Last edited by tadpole1969; 09-09-2014 at 07:20 PM.
09-10-2014, 04:17 AM
#17
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Location: ohio
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09-10-2014, 10:34 PM
#19
2nd Gear Member
Thread Starter
Join Date: Nov 2013
Location: ga
Posts: 273
got my tuner today installed the preloaded tune after i edited the user option for the axle ratio to 3.73, only thing is rpms in 1st gear, go to 3000 rpms! which is way to high for first gear before itll change outta 1st, any ideas what needs to be done dawson or anyone that has done this tuneing before , i returned it to saved stock file till i get it figured out ! really wish i had the sct advantage software to edit the tune file my self
Last edited by tadpole1969; 09-10-2014 at 10:37 PM.
09-11-2014, 05:32 AM
#20
5th Gear Member
Join Date: Jul 2012
Location: ohio
Posts: 3,628
got my tuner today installed the preloaded tune after i edited the user option for the axle ratio to 3.73, only thing is rpms in 1st gear, go to 3000 rpms! which is way to high for first gear before itll change outta 1st, any ideas what needs to be done dawson or anyone that has done this tuneing before , i returned it to saved stock file till i get it figured out ! really wish i had the sct advantage software to edit the tune file my self
Who did the tune for you? Its kinda common for a canned performance tune to raise shift points in your automatic transmission. That's how performance modes are on modern cars that have a sport button on the shifter. That's the way performance tunes work. The idea is that at lower speeds it keeps your rpms in the optimal power band range. This enables you to rapidly accelerate with the maximum amount of power from a low speed take off. The down side of this is that your trans remains in first gear longer than normal when your driving it in normal traffic.
My moms Saab does the same thing when sport mode is selected. Below 30mph the trans refuses to shift out of 1st , but it makes accelerating much more exhilarating.
Obviously with a tune that is preprogrammed there will be slight variations from car to car, that is why most guys get a custom tune done at the dyno.
