Different between HJ45 4 speed and 5 speed length gearbox

[Dag Einar]

Can someone tell me if there is a difference between a 4 speed gearbox and a 5 speed gearbox when it comes to length?
I am strongly considering putting a 5 speed gearbox in my HJ45 1980. It already has power steering and 2H, so there is really little difference between an HJ45 and an Hj47 as far as I am concerned....

 

[Rodger]

I can't give you the definitive answer but I can tell you that my 40 has a 2H with a 5 speed box and the gearbox mount is original and has not been moved/repositioned.
Looking closely at the photo of your engine I think our engines are positioned the same in relation to the bulkhead so it leads me to think that the transmission - 4 or 5 speed - are the same length.
Hope that is some help

Regards,
Rodger

 

[Dag Einar]

Thanks for your answer.
I assume that the H and 2H have the same length?
And therefor it wouldnt be problems with a 5 speed gearbox. But Im just curious, if it is the same its just go for the work...
It would be nice to ride with a lower rpm when it comes to noise and every thing.
Im into thinking of putting in a turbo as well, I do have the turbo and the manifold.

 

[Rodger]

I did consider a turbo but opted for headers instead and the engine breathes so much better and pulls from very low revs.
The 5 speed makes cruising much quieter and easier at the lower revs.

 

[jah]

Been there done that! The H55F is 88mm longer because of the 5th gear than the H41