Ford F-Series 4WD Chassis/Body Features - Frames, Suspension, Fuel System

This is page 18 of a Ford F-Series 4WD dealer/technical brochure covering chassis and body features of four-wheel-drive F-150, F-250, and F-350 trucks. It describes frames built of hot rolled low carbon steel with 36,000 psi yield strength; wheelbase choices (117-inch and 133-inch F-150 Regular Cab, 155-inch SuperCab, F-250 Crew Cab) with box lengths from 6½ to 8 feet; tread dimensions averaging 64.3"/64.4" for F-150 and 66.3"/65.0" for F-250. It explains the 3-point engine mounting system for Six and V-8 engines, tube-and-corrugated-fin radiator design, and fan configurations for the 4.9L (300) Six (4-blade 18.5" or 7-blade 18.25" flex fan with A/C) and V-8s (5-blade 18.5" spider or 7-blade 19.5" viscous clutch fan with A/C). The exhaust section notes a single right-hand exit system on all 4WD models. The fuel system section details steel tanks (.032"-.042"), a standard 19.2-gallon rear tank, and an optional auxiliary tank for up to 45.2 gallons total. Front suspension coverage explains the F-150 Regular Cab coil-spring setup with splayed radius arms and track bar, and the tapered two-leaf single-stage constant-rate springs on F-150 SuperCab and all F-250 4x4s, with a photo of the front axle assembly.