For my 2005 PLUS 4, all these datas are in the Morgan Owner's handbook page 3.
For the 2005 PLUS 4
the rear axle ratio is 3.73:1
gearbox (FORD MT 75)
1st 3.61 / 5.31mph @ 1000 rpm
2nd 2.08 / 9.20mph
3rd 1.36 / 14.09mph
4th 1. / 19.15mph
5th 0.76 / 25.10mph
Mazda gearbox had the same ratios except for 1st : 3.87. But perhaps depending on the year?
