Jump to content

- - - - -

A15 transmission swap

  • Please log in to reply
21 replies to this topic

#21 datzenmike



  • User Administrator
  • 71,780 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 09 March 2013 - 10:56 PM

I'm curious if datsun 4-speed tranny and 5-speed tranny are just the same but the fifth gear is forced by adding some gears. Anyone knows? And is there some sort of gear sets for datsun trannys anyways? And how could i calculate gear rations if i have to go with 4-speed but change the 3rd and 4th ratio so that they are bigger. Need knowledge :/


Here's a handy little gif to show that a 4 speed does not have a 4th gear. Power is simply transmitted straight through the mainshaft and out the back. 




A 5 speed has an overdrive gear behind the reverse gear. The bottom counter shaft gear is larger than the one on the mainshaft. Thus the mainshaft turns faster than the engine. Even a 5 speed has no 4th 'gear'

Posted Image

#22 D.D.Anderson


    Advanced Member

  • Members
  • PipPipPip
  • 149 posts
  • Location:Bø i Telemark Norway
  • Cars:1978" Datsun Sunny B310 Van

Posted 30 March 2014 - 01:47 PM

You won't find 5 speeds for lower then 600 now today...

had to pay 850-1250$