Shifts Hard Into Reverse?

I drive a 1991 Ford F-150 XLT Lariat. It has a 5.8 liter 351 Windsor and an automatic 4 speed transmision with overdrive. Recently I have noticed when I shift into reverse, before letting off the brake, it "kicks" real hard into reverse. This truck is a daily driver and this occurs about once every two... show more I drive a 1991 Ford F-150 XLT Lariat. It has a 5.8 liter 351 Windsor and an automatic 4 speed transmision with overdrive. Recently I have noticed when I shift into reverse, before letting off the brake, it "kicks" real hard into reverse. This truck is a daily driver and this occurs about once every two days or so. What could be wrong? How could I fix this?
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