I had one on my '86 F-350 4x4 Crew Cab. It had a 6.9 and a 3 sp auto and 4.10:1 gearing. The GVO helped immensely across the board in pulling power, highway cruise speed and fuel economy.
It wasn't cheap, I think it was $2600 installed. If I remember right it was a .87 OD and effectively turned the 4.10 to a 3.20 and I saw an 18% rise in fuel economy.
If I had it to do over again I think I would go with the Liberty OD box. It was set up to go between the transmission and transfer case to be able to use all the gears in both 2x4 and 4x4 modes. It would be more expensive requiring more mods but I think it would be more versitile.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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