Hello,
My name is Wouter and I am from Belgium, I was looking to do a conversion to 5 gears with overdrive for my c303.
i would like to drop some engine speeds for cruising and also for noise reduction and fuel economy.
I'll try to show you what I do.
I started with a gearbox from a c306, these have a 5-speed shift pattern type: ZF S5-18/3
Then I also bought a gearbox from a Maserati Biturbo, which then had an overdrive of 1-0.791
I got both apart. the difference between the gearboxes is: 5 the gear is in a different place.
they use a different syncromash lever used on the top instead of the bottom. The 3rd and 4th of the c303 and 3rd and 5th of the maserati have swapped places. for that I will have to convert the shift arm and syncromashes from the maserati box to the TBG box. I'll try to rebuild the front half of the gearbox so I don't have to do the tapping again. There is also a spring-loaded ball that holds the shift levers in place. this ball is on the other side of the box.
All I have to do is level the top of the maserati box once. there is room for this. to be continued.... Wouter