The 3/4-1 Ton "OBS" Ford truck was designed in the 1970's with upgrades until the end of the model run in 1997. Remember the first version of the "OBS" Ford truck was first offered for sale in the 1980 model year. Dodge in this era ran their "OBS" from 1972-1993 with upgrades of this 1960's designed and engineered truck. GM ran their "OBS" from 1973-1991 with late 1960's early 1970's design, engineering and upgrades. Good trucks however nowhere near "Modern" in so many ways by today's standard!
Fact of the matter is these "OBS" trucks are down right CRUDE!
The new "Heavy" F250/F350 Ford truck started anew in 1999. These trucks were designed clean sheet in the mid 1990's. Dodge started their new body in 1994 with early 1990's engineering. They made a big upgrade in 2003 with a new Dodge truck. GM started their 3/4-1 ton trucks in 1992 with late 1980's engineering and again in 2001 with the new design truck engineered in the late 1990's. In each situation the "New" trucks took huge in leaps in engineering, comfort, reliability, fuel economy and design over their previous "OBS" older brothers.
If you look at ALL VEHICLES not just trucks offered for sale in total by ALL OEM manufacturer's world wide between 1998-2005 virtually every OEM manufacturer completely re-engineered and re-designed every model of every vehicle they offered in their total lineup during this time frame with modern CAD design and modern manufacturing practices for parts. DIGITAL control is a wonderful thing! GM, Ford, Dodge, Honda, Toyota on and on ALL totally re-designed and re-engineered their complete brand and vehicle model offerings. ALL for the better!
Starting in 2001 with GM you have a completely new truck with the revolutionary LS based gas engine, Duramax Diesel and the 8.1 litre "Big Block" engine options. While the old Chevy Small Block was a good engine that engine in NO WAY COMPARES AT ALL to the LS engine which is a TRULY GREAT ENGINE! Little if anything offered anywhere in the world by any manufacturer comes close to an LS engine for power, reliability, small packaging and aftermarket support. Used parts are EVERYWHERE! Ford/International in all their wisdom decided NOT to make the 7.3 diesel emissions compliant and bestowed upon the Ford faithful the 6.0 Powerstroke! What a disaster! Dodge in 2003 came up with their new truck and upgraded once again the Cummins 5.9 24 valve to the Common Rail HO 5.9 which is probably their best diesel effort installing the HO 24 valve 5.9 a truck that was now overall a pretty good truck!
The automotive world took HUGE gains in quality, reliability, ergonomics, fuel economy and most anything else you can think of during this GLORIOUS TIME OF REVOLUTION NOT JUST EVOLUTION (1998-2005) in the automotive and truck world. Look at the automotive aftermarket, the car shows on TV and the new fantastic parts offered for many vehicles that are based upon engineering concepts from this time period. Much of this innovation goes back to this 1998-2005 era when the OEM's FINALLY decided to spend the money to design and sell much better vehicles. This trend now means newer designs and upgraded on a more frequent basis. No more 16-18 year runs for a truck body design. Most will say that's a good thing and few with piss and moan! The Chevy LS Engine family is by far the most used engine for engine swaps in most any vehicle, car or truck.
Expensive? Yes all this new engineering, innovation and manufacturing technology costs money and you the customer are gonna have pay for it! The rewards are MUCH BETTER TRUCKS in oh so many ways! Given all these facts why would anyone in today's world (2019) want to consider anything "OBS" built before 1998-2005 for any type of daily driver or Overland vehicle that they will full time travel within?
Nostalgia? Your Cheap? You live in a cave and hate progress? I guess there are all sorts of reasons to justify in your own mind and thoughts about why an "OBS" truck is so good. For the rest of us nothing could be further from the truth!
All I can say is this:
They sure don't make cars and trucks like they used to!
As for myself I am sure as Hell glad they DON'T!!!!