Algodoo

so the issue that ive been facing is 1st gear flying all over the place when driving faster. does anyone have any ideas? ive thought of a way to fix the 1st gear problem but havent tested it out yet. should my gears be different sizes?

Controls:
enter : engine brake
' : start engine
D : driving mode (should be on)
1, 2, 3, 4 : gears (no reverse)
left/right: throttle
down : brake
pagedown/end : hood
home/page up : trunk