Is this normal? when I come to a stop, the suspension feels like something is shifting or moving. It does this right before I come to a stop. BTW it is a 4x4.

Sounds like (a) bad control arm bushing(s).
Look very closely at the inner bushing shoulder where it protrudes out of the rubber it should be fairly symmetrical if the bushing is not hammered.
If there has been a chronic oil leak where oil has been in constant contact with any of the rubber in the bushings check those closely. I.e. power steering pump leaks will soften the rubber bushings on the passenger side.
Do you gat a lot of "rut steer" meaning does it wander and jump when crossing ruts in the pavement? Lose bushings can cause this.

no it steers fine. i think it is coming from the rear. i can sometimes feel it when the rearend goes over a speed bump. it feels like the rear end is shifting or something. i read something about dry splines? needs the to be greased up?

sounds like a similar problem I have with my 97 4Runner. Feels like someone is tapping your bumper right after you come to a stop. Feels like something in the transmission or drive train.

What is your idle rpm with the transmission in neutral?

Grease all the fittings on your propellor shafts, particularly the splines. I bet they are dry. Use moly grease.

Just an FYI to those getting thumped in the rear.
I was on a trip this weekend and thought I would test my original hypothesis.
I held the RPM at about 1800rpm and came to a stop and WHOA! The whole truck lerched and then settled what seemed like "back" I could replicate this every time with the "idle" set too high.
It is a side affect of the transmission shifting down under "acceleration" not a normal scenario.

Check your idle when in park or neutral just after you experience this "phenomenon".
Set it to your engines specifications (~800rpm).
Hope this helps.