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2008 Ford F-150 - Bucks

I have a 2008 ford f150 xl 4.6 2 wheel drive supercab when ever im driving between 30 and 45 mph sometimes truck will start bucking like it cant go into gear started doing this when I had new plugs and coils installed so I put new transmission and torke converter truck had 160000 miles still does same problem not as bad when you take overdrive off any ideas?

I always look first at the last thing someone touched. Why aren’t you taking it back to whoever changed the plugs and coils?
You changed the transmission on a hunch? I’m astonished.

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