If it is not four-wheel drive, there is a problem that the front and rear wheel RPMs do not match, so the vehicle does not speed up How can I solve this?

Hi. I’m trying to implement front wheel drive and rear wheel drive in my game, but I’m having trouble.

If it is not four-wheel drive, there is a problem that the front and rear wheel RPMs do not match, so the vehicle does not speed up

How can I solve this?