Is it normal for my 2004 lincoln aviator to throw in the revere shift so hard.?

I just bought a 2004 lincoln aviator that seemeded to be working perfectly well when i purchased iuntilll about two days after. the reverse parking sensors stoped working and when I put it in reverse it takes about 5-15 seconds to take the shift and when it does it slams it. I mean i actually jerks my head back. Now everyone tells me that i am overexerting and that im just not use to driving a V8 but im still freaking out. Can any one with experiencece with this car model and year give me feed back. thanks
 
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