00SabreC2,
I know a little about the rear gear stuff for the shafties.
The gear ratio is 3.40 but other "model/s" in the Honda line will interchange. Most that I know use a gearset(only) from the V-4 Magna's which are 3.18 to lower the rpm's. Otherwise the people are looking for a cheap stock replacement gearset (3.40's).
A guy on the V-Four Sabre site(
www.v4hondabbs.com) (Dave Dodge) has these gears AND will do the install to your final drive unit. I think he also will swap units....just not sure. He's got a website but I can't find it right now. Asking the V-4 board people will get you to him.
Sometime ago I replaced my final drive gear set and the price for the gear set was $238.00 and that wasn't counting the cost of the "seals and other associated pieces" needed for replacement. So it's quite expensive IF your on a budget.
Hope this helps.
Bullzeyet