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post #1 of 2 (permalink) Old 04-13-09, 02:34 PM Thread Starter
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Shift Kit for Newbie

Hello all, it was recommended to me to get a Shift Kit for my V6 Automatic 07 Mustang. I was wondering if anyone could explain what a shift kit is and would it make a difference in the performance of the Car?


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post #2 of 2 (permalink) Old 04-16-09, 06:08 PM
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Re: Shift Kit for Newbie

Well, shift kits are used in older transmissions that are not electronically controlled. It eliminates overlap of 2 gears when it shifts. A shift kit makes more positive shifts into one gear, and less friction, and more of a positive shift, creating a "bang" into each gear. These kits were physically installed into the transmission.

Nowadays, as in the case of your 2007 Mustang, the PCM (Powertrain Control Module), or computer, shifts the transmisson into various gears. There is no aftermarket shift kits for the new Mustang transmissions (the 5R55S model). Therefore, an aftermarket "tune" is used to manipulate the shifts. Common brands of handheld tuner modules are SCT, Diablosport, etc. An experienced aftermarket shop has tuning personnel which can make a new program which will contain the upgraded shift programming for your car. (Increase in shift points, which is at what RPM's the trans shifts, kickdown, and line pressures, for example.) The module is plugged into the OBD2 port under the driver's side dash. The old program (aka the stock factory tune) is downloaded from the PCM into the handheld, and the new custom program is uploaded into the PCM. There is no work to be done on the trans. itself. Check out or , two very popular aftermarket tuners.
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