You drop the tank and pull it from the top. The tank is a saddle type with the fuel pump on the left side and the auxiliary module on the right side. There is a common lock ring wrench that you can use to rotate and release the ring. There are index marks you should take note of (take a picture) before removal, and make note of the pump orientation. Careful to not damage the float arm. You may have to bend it a little as you slowly pull the pump. You pull it out just far enough to disconnect the aux connection at the bottom. There will be fuel in the pump, it will spill when you tip it.
Installation is the reverse, make sure all the index marks are lined up and all seven notches are engaged.
To drop the tank, first release the fuel system pressure and disconnect the battery. Pull the filler hose and purge lines from the tank, remove the muffler. The ORVR vapor and vacuum lines have quick-connect fittings. Remove the propeller shaft. Disconnect the electrical connector at the rear crossmember, remove it from its tab and push it aside. Take the left side body skid plates off, if equipped. Disconnect the fuel supply line quick-connect fitting. Support the tank (there is an adapter available for this) and remove the tank support strap retaining bolts.
Installation is the reverse.
Before you drop the prop shaft, put index marks on the flanges and cases so it goes back in the same place. To remove the shaft you drop the exhaust system loosen the ends, remove the center bearing heat shield and loosen the center bearing bracket. You pull the shaft from the axle pinion shaft first.
Good luck