I installed the toy tec 3" lift a few weeks ago. I had it aligned shortly after that. I now have a vibration in the front end-or at least it feels like the front end. Anyone else have similar issues? I was thinking maybe the differential drop was the problem? Any comments ?

Try putting it in 4x4 HI, driving for a mile or so, then putting it back to 2wd.
If it's dry out and all you have is pavement, do this on a fairly straight road.

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Nice truck!...Sorry about your penis.
2007 DC Tundra, 5.7L, Limited, Factory NAV, TRD, TRD Duals, TRD CAI
Truxxx 3" + 1" lift, Rear Supersprings, BFG TA/KO 305/65R18

what does driving in 4x4 do mxsjw?

It will realign and lube all the front end components.
I can feel mine (just a tiny bit of vibration) when I haven't done it for a few weeks or so, I just do like I said above and it goes away.
By the manual, we are supposed to put it in 4x4 for 10 or more miles every month to keep everything lubed up.