Front
Lean Correction - Front, F-250 and F-350, 4x21. If lean correction is required, remove the high side front coil spring.
2. Compare the height of the original front coil spring with a new one with the same part number. Note the difference.
3. If the original front coil spring exceeds the height of the new one by 13 mm (1/2 inch), install the new front coil spring in the vehicle.
4. If the original front coil spring is shorter than the new one by at least 13 mm (1/2 inch), remove the low side front coil spring from the vehicle.
5. Compare all three front coil springs and select the two most evenly matched for installation.
6. Install the tallest replacement front coil spring on the low side of the vehicle.