2007 Ford Ranger rear end jerks on acceleration after a downshift at about 20 MPH?

2007 Ford Ranger 28,000 miles, 8.8" Rear axle 3:18 gears auto trans. Every now and then when I accelerate from around 20 MPH and the truck downshifts there's a small jerk in the rear end a second after the downshift. Is this normal? I just bought the truck and never had RWD before. If someone knows what the problem is that would be awesome!

I would check the U joints

You drive a ford. That's the problem.

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