Well I guess that depends... For street use and things as mild as jumping a curb, I think the pan needs to be notched for stock to 2.5" lift. It WILL hit. I used to rock crawl back in the day. When aticulation is important, you want to be able to stuff the axle up high and tight, so for a lot of articulation, I think you'll want to notch the pan even with a bigger lift, since bump travel may be near the same as stock (the balance and majority of travel being in droop of course). The exception would be if you body lifted and used taller motor mounts.@turbophil - You are the first I have seen notch the oil pan to clear the connecting link. In your opinion, is that only needed for stock to 2.5" lifted truck? I know Dustin's kit is designed around lowering the steering box support to clear the oil pan...was that lowered on your rig also?
As they say, "if you need a ruler, it's too close"... or at least that's what I say when it come to driveline clearance on a vehicle that may/will see the trail...
I left my steering box in place and put a small speed dent in the oil pan riwhen the support bar is. It didn't take much to get the clearance needed there (1/2-3/4" inch or so) and since that component doesn't move, the above ruler guideline doesn't apply