Review on π Enhance Your Speedometer Accuracy with the Hypertech 730120 Speedometer Calibrator by Rusty Smith
Fixed Hard Shift
I put 35x12.5x20 tires on my 2011 Super Duty. I only had the tuner tuned to 33.9" tires. The transmission shifted poorly between 2-3 and 4-5 gears. Installed and works like silk again. Took about 30 minutes to install. Full instructions with pictures are on their website.
- Easy to install on factory wiring harness - no connector required
- old
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