I have a 91 ford bronco that takes forever to shift into rev and drive when started

So when we start the bronco in the morning it starts up just fine, but then it
takes nearly a minute before it'll shift into reverse, and even longer to shift into
drive. like, you put it in reverse, back out of the driveway, shift into drive, and
then sit for 45-90 seconds before it actually shifts into drive and you can drive
away.