Attached is a gear ratio excel spread sheet that I co-authored.
On the 1st sheet you can swap between 1st gen VMax, 1st gen Venture, 2nd gen Venture or Royal Star Tour Deluxe Venture to see speed difference. Under tan field labeled Bike Model, input 1~4, depending on model. Field for VMax or Venture final drive below that. Black fields are locked. Password to unlock sheet is 'ratio'
Upper right block picks tire size or the measured circumference of rear tire.
Upper left chart will show gear ratios for chosen options.
Lower right chart will show speed at different RPM's in all gears based on chosen inputs.
I know a 1st gen (83~93) will fit in with no problems. This has the closest gear ratios to a 1st gen VMax.
I am also 99% sure a 2nd gen (09~13) will fit in. On of the Venture guys has put a 2nd gen gear set in a 1st gen case. Ratios are not as good for acceleration on 2nd gens. Will improve top speed though. Royal Star Tour Deluxe should also fit OK.
2nd Sheet (Range) is used to do calculations on 1st sheet, no user changeable fields on 2nd sheet.
Gary