Hello,
all of the dimensions changed in 8/1975 from type 002 to the 091 gearboxes (only 15mm in total, but some parts are shorter, others longer) - so there is no easy exchange. it is possible, but not plug'n play. You need to mix parts so the gearbox fitting somehow in your bus.
So I expect you have a CM for the 1.8L type 4 with 4,857 ratio.
A CE for the smaller 1.6L type 1 engine with a 5,375 or later 8/73 5,428.
My late 2L type 4 with CP gearbox have a 4,571 ratio - is not a racer or good for hill climbs, but good for high way - often quieter due to some lower engine rotation speed.
good luck,
all of the dimensions changed in 8/1975 from type 002 to the 091 gearboxes (only 15mm in total, but some parts are shorter, others longer) - so there is no easy exchange. it is possible, but not plug'n play. You need to mix parts so the gearbox fitting somehow in your bus.
So I expect you have a CM for the 1.8L type 4 with 4,857 ratio.
A CE for the smaller 1.6L type 1 engine with a 5,375 or later 8/73 5,428.
My late 2L type 4 with CP gearbox have a 4,571 ratio - is not a racer or good for hill climbs, but good for high way - often quieter due to some lower engine rotation speed.
good luck,