Ford Performance Speedcal
The Ford Performance M-4209ADAPT-AC Speed-Dial Speedometer Adjuster/Recalibrator is used to correct your Mustang's speedometer after tire size or rear gear ratio changes. No longer is it required to purchase a tuner to get your speedo working again! This Mustang speedcal scales a frequency based on the vehicle speed signal up or down to maintain accurate vehicle speed indication to the instrument cluster and PCM. This speedcal also allows the use of 1999+ transmissions into your 1996-1998 Mustang.
-Fits 1994-2004 Mustang with manual or automatic transmission
-Fits 2005-2010 Mustang with manual transmission
-Fits 2005-2010 Mustang automatic, but is limited to equivalent of one step higher or lower gear change ratio (+/- 10% change). For example, if your 05 automatic has 3.31 rear gears stock, you can step up to a 3.55 & keep your speedo correct using this adjuster.
To maintain cruise control function on 2005-2010 Mustang automatic and manual transmissions, gear change is limited to equivalent of 5% higher or lower ratio (<+/-5% change). For example, a gear change from 3.55 to 3.73 results in a gear ratio reduction of 4.8% so cruise control will continue to operate normally. A gear ratio change from 3.55 to 4.11 results in a gear ratio reduction of 13.6% so cruise control operation is lost.
Ford Performance - Mustang Ford Racing Parts
Ford Performance Parts is the leader in performance parts and accessories for Mustang and Ford Lightning.
LMR.com is proud to offer Ford Racing Performance Parts for your project. Ford Racing is dedicated to manufacturing the highest quality products offered in the industry. Choose from suspension, exhaust, wheels, and other performance parts at LatemodelRestoration.com. If you want the best for your Mustang or SVT Ligtning, look no further than Ford Performance Parts!