A transmission dipstick is not required in order to drive a car, but it is highly recommended. The transmission dipstick helps to ensure that the transmission fluid levels are correct and helps to prevent transmission problems. Without a transmission dipstick, you would have to guess at the transmission fluid level, and if the level is too low, it could cause transmission problems. The transmission dipstick is a small, but important, part of your car, and it is well worth the few minutes it takes to check it.