GO TO YOUR GTA / DATA / HANDLING.CFG <- OPEN HANDLING.CFG WITH NOTEPAD!
Then you have to find the car mod and replace with this new line

WILLARD      1059.9 4099.9 2 0 0.1 -0.48 75 0.7 0.8 0.47 5 350 35 5 R P 8 0.45 false 55 2 0.15 0 0.2 -0.04 0.14 0.3 1.25 0.1 19000 80000000 1700002 0 3 0