Overdrive transplant

[Gadgetman]

Afternoon all. 

Can you take a overdrive unit and plate off of a 1600 gearbox and transplant it onto a later 2ltr non- od box?

i assume I’d have to replace the mainshaft as well?? 

[Clive]

I don't think so, I believe the mainshafts are different between the 1600 (3 synchro) and the later boxes. And yes, you need an overdrive mainshaft (and don't forget the drive for the OD pump!)

[Pete Lewis]

without a pair in front of me the tail end is pretty much the same across the range its unlikely the rear cover drilling vary from 3 to 4 sync. 

 from the parts manual  both use the same adaptor plate  1600 and 2litr 4sync  use 305137

the base  D Type does have a number change  1600  306553    2ltr  307862

this may just be evolution

im sure a call to dave twigger at http://www.odspares.com/    im sure he will have some definitive data 

but as far as i know it should be ok, the mainshaft tail spigots are the same and the small sprung clip is used on both

Pete

 

[Clive]

Pete, rimmers has this

https://rimmerbros.com/Item--i-204679  for 3 synchro gearbox 

and this  https://rimmerbros.com/Item--i-TKC923 for the 2 litre.

Implication is it is a different beast.

Saying that, a new mainshaft is not a bad idea anyway........

[Pete Lewis]

Yes the 3 sync  4sync  mainshafts are very different inside the box but the bit sticking out the back that enters the OD is the same 

Pete