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For 1973, GM redesigned its medium-duty (Class 5–7) truck range for Chevrolet and GMC, slotted between 1-ton trucks and the Class 7–8 H/J and C/M heavy conventional trucks (designed by GMC). Designed by Chevrolet, the trucks mated the Rounded-Line cabs to a heavier-duty frame and a taller hood; with the exception of the steering column and ...
The original short-wheelbase 90-inch (2,286 mm) and the new long wheelbase 108-inch (2,743 mm) vans came with a 5 × 4-3/4" lug bolt pattern. An addition for 1967 was the G20 heavy-duty 3/4-ton version. The G-20 featured heavier suspension, a 12-bolt rear axle, and increased hauling capability with wheels having a 6-lug bolt pattern.
To accommodate the wider, heavier-duty front axle, the van body was fitted with a larger front bumper and plastic fender flares (shared with the F-550 truck). Several wheelbases were offered, ranging between 159.5 inches and 233.5 inches; as with the Super Duty and the E-350/450, the E-550 was powered by either a 6.8L V10 or a 7.3L V8 turbodiesel.
For 1980, the 3-speed column-shifted manual was retired in favor of the overdrive-equipped 4-speed (floor-shifted) manual. For 1988, the standard transmission became a 5-speed manual (with the 3.9 L V6); a 4-speed automatic became optional for the V6 and the 5.2 L V8, with a heavy-duty 4-speed automatic for the 5.9 L V8 added in 1990. [3]
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Optional equipment included off-road under-body skid-plate protection, Traction-Lok rear limited-slip differential, and a heavy-duty trailer towing package. Optional was an electronically controlled pneumatic air suspension system that would raise and lower the vehicle depending on road and load conditions.