I have a non-turbo 1977 123 series 240D (616912) with manual gear (4-speed) and would like to replace the engine with 300D (617912) engine again with a non-turbo engine.

Could anyone kindly guide me if I have to replace the gearbox and the differential as well?

If I also replace the 4-speed manual gearbox with a 5-speed manual gearbox, do I need to replace the differential as well?

Thanks

I may not be aware of all the different parts but,

The diff ratios are different
Driveshaft length(?)
I think transmissions are the same. you might do some searching on Auto to manual tranmission changes. This is make the 617.912 quite nice. Someone here will know more=)




Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E

You are gonna want the taller final drive for running highways at 80+ mph and best appreciate the car, otherwise driveshafts are the same.

Is the 300D 5 spd. transplant engine complete as single unit, or are you mixing 300D with 'found' 5 spd. tranny?

If the 300D engine came from automatic, you've got flywheel/clutch to contend with, irregardless if you use the 4spd. or 5spd. tranny.

__________________
'80 300SD/ w116
'79 240D 4-spd
'71 750cc Guzzi

previously owned:

'83 240D 4-spd
'77 280SEL 4-spd
'74 280/8
'72 250/8
'65 220Sb 4-spd
'63 220Sb 4-spd
'63 190c 4-spd
'61 220Sb 4-spd
'60 190b 4-spd