The problem when replacing the oil pan gasket is the removal of the oil pickup. The gasket and windage tray are one unit, and the oil pickup AND the windage tray are held in place with two bolts. There is a third bolt that holds the oil pickup tube to the oil pump - and THAT is the bolt that would be extremely difficult to get to without removing the engine or the front diff. Even with the diff removed I'd wonder about the ability to get around the crossmember.
Here's a pic for reference. You can see the two bolts holding the pickup tube and windage tray in the center of the pic; the bolt holding the pickup to the oil pump is at the far right at the base of the tube. Note that this pic was taken with the front timing cover off the engine so much easier to see.
Keep a bottle of oil handy or get some UltraBlack RTV and spread around the leaking area. Wait to replace the gasket till you replace the engine.
2003 Renegade, Black
- 3.7L, 42RLE, 4X Guard Trans skid, Factory Engine, T-case, Tank skids, Modded BoulderBars sliders, OME 927/948, Bilsteins, JBA A-Arms & 1/4" top plate, 2-ring clevis, 1 extra rear iso/side, Moabs with Firestone Destination AT's 255/70-16. Future: 4.10's