Hi and welcome.
We don’t know what model year you are looking at. Could you please provide this?
I know I don’t recognize the 16G and 16Y chassis designations you are asking about, but I assume you mean Ford E350 and E450 as those are the only two chassis options available.
On current model Minnie Winnies the 25B specifications say that the Ford E450 is the only chassis available.
Quote:
Ford E450 Chassis 350-hp 7.3L V8 Premium engine, TorqShift 6-speed automatic transmission w/overdrive, 210-amp. alternator (25B, 26T, 31H, 31K)
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I don’t know if previous years offered a chassis option or not. But since I don’t know what year you’re looking at I can’t look that info up.
If the 16G and 16Y chassis designations are referring to something else I apologize for my ignorance. Winnebago makes hundreds of models with so many options that we can’t know them all