John, no problems whatsoever. If you're only talking about the rear drop, Steeda uses shackles. I've ran mine in both the 2" and 1" drop positions. They don't affect the bars at all.
If you're talking about an all-around drop, the 2" kit only makes about 1" drop on a Lightning and that won't affect the bars at all. Matter of fact, the brackets on the torque arms don't hang as low as the transmission cross member so I don't think there would be a problem with any amount of drop, except perhaps for the axel being pushed too far out of its design travel arc.
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Later!
Jeff S.
President, NLOC
#74 in '95 - 11.92@115.2
#?? in '00 - 13.68@99.5