Heavy 3/4 ton?
Elder User
Joined: Jan 2010
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From: Hattiesburg, MS
The light duty vs heavy duty F-250 ONLY APPLIES TO 80+ trucks. Basically, the light duty F-250 will typically have a lower GVWR and semi-floating rear axle. When Ford switched the the Super Duty body style in 99, the light duty F-250's kept the F-150 body style. Then, everyone starting getting confused, so they called them heavy duty F-150's instead. GM offered light duty 2500's too. But, then....just like Ford, they started calling them 1500HD's instead.
Laughing Gas
Joined: Mar 2007
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From: southwest Wisconsin
Though there was no official designation of heavy 3/4 or light 3/4 ton trucks back in the 70s, I can remember that we used those terms at the time, kind of like slang terms I guess. I had a 78 F250, 7800 GVWR that we refered to as light 3/4. I may be a forgetfull old fart, but I can still remember that. 
Posting Guru
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for the 78s my ford book shows 4 gvws [6200/6900/7700/7900lbs] for a f250 reg cab 2wd and yes there is minor differnces between over or under 6900 gvw
over 2 piston front brakes 6900 and under single piston
over bigger rear brakes/drums under smaller
different draglink/front spindles/king pins/spring ratings
the ford book shows about 30 ratings for f150/250/350 reg/sc 2 wd/4wd
over 2 piston front brakes 6900 and under single piston
over bigger rear brakes/drums under smaller
different draglink/front spindles/king pins/spring ratings
the ford book shows about 30 ratings for f150/250/350 reg/sc 2 wd/4wd
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Posting Guru
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From: Norton, MA
The rear hub sticking out thing may be a decent indication ya. It probably doesn't apply to all trucks with the heavy duty designation, as it is probably a factor of what axle the truck has in it, but I had an 84 F250 Heavy Duty, the one pictured on my little name tag thing actually, and it had the rear hubs that jutted way out like front ones. I loved that look.
AleX
AleX
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From: Hattiesburg, MS
x2 This discussion is irrelevant for 73-79 trucks.
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