Low speed shake in front end.

I had a Rough Country 2 inch leveling kit on my 2007 Tacoma, now there is a low speed shake in the front end. When I get the truck to 30mph it stops the shake. Any idea what I have done wrong? I was told by the company I got the parts from that my CV joint has gone bad. Any ideas would be greatly appreciated.

 

My friend's Tacoma had what felt like driving over rumble strips at low speed. Though it was something in front end but ended up being the rear drive shaft.
One of the u-joints was dry and it made the shaft wobble in the carrier bearing.

 

It does feel like rumble strips, I will look into that. Thank you for the info.

 

Did you ever figure anything out? I sent you a PM. Thanks

 

I am having this exact same problem. I have found that if I put it 4 wheel high it is smoth up to about 30 mph. But in 2wd it feel like a rumble till about 35 mph then it completely goes away and is very smooth?