Ok, looked at the pics and the 1.83 is going to be second gear. The 1st gear is a double reduction gear set, as opposed to the single reduction of the current gear setup in the tranny. So there are actually 4 gears, and 2 share the same axle, so the reduction is a bunch.
Plus it is not an auto shift, it requires a 3 channel radio to operate.
Looks like we will not have the killer 1.16 ratio for 2nd gear. Poo!
I guess that my ponderings were actually worth something.
Heres some pics
parts layout
cut away drawing
Notice the double gear on the rear gearset.