It drops down between body and front axle; somewhat snug fit. You probably should have access to a pit. We had a metal shop fab a new tank using the old one for a pattern. Eliminated the recesses on both ends. The new tank held about two gallons more or now 29 gallons. This was done about 20 some years ago on our previous 4104. Although we didn't, a fuel sending unit could be installed while you are at it. Because of the shape of that tank, the fuel level will drop faster after 1/2.