So I have an 85 Toyota truck 2wd 5spd, how should I go about lowering the front end while keeping it drivable and not ripping a hole in the oil pan? Also would a dual wheel axle bolt in or would I need a welder?

That's just retarded...you're basically reassembling the entire frame for an appearance to a truck that's just stupid to begin with. You'd spend well over 10k to get all that done, and ultimately all you get is a small truck on stubs.

You'd have to re-do too much. That's not even adjustments anymore, that's reconstruction.

lowering springs or coil overs for the lowering question.. not to sure about the axle.