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Right gearbox?

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Right gearbox?

Posted by Dave Young at November 17. 2018

hi - I have a 1959 Dominator 99 and need to know the correct gearbox for the engine please and the price I would need to pay for the gearbox. Many thanks - Dave

Re: Right gearbox?

Posted by anna jeannette Dixon at November 18. 2018

Previously Dave Young wrote:

hi - I have a 1959 Dominator 99 and need to know the correct gearbox for the engine please and the price I would need to pay for the gearbox. Many thanks - Dave

well you need a AMC mk1  gearbox  most a stamp marked with a N , or a mk2 as fitted to the Atlas  and 650ss

Re: Right gearbox?

Posted by alex_arthur at November 19. 2018

Dave, to add to Anna's advice, your bike would originally have had an 'N****' series serial number box. The later NA series will also fit as will M and (later) MA (Matchless) boxes as they are essentially the same. The later boxes have a better ratio selection for 3rd gear. Commando boxes for RH change bikes will also fit but will need a spacer (1/8" iirc) on the top mounting bolt. As it happens, I have a spare N series box...

Re: Right gearbox?

Posted by howard_robinson at November 19. 2018

Dave - Generally the AMC boxes for Matchless and AJS models are not suitable for your Dominator. Avoid boxes with an M prefix as per the previous contributor's suggestion because the main-shell has the mounting lugs offset so they will not align with Norton engine plates.   The engine plates could be modified but then the primary change adjustment will also be problematic.  The gear sets will interchange but main-shaft length can also be different.  I am not familiar with prefix MA boxes. So stick with Anna's recommendation and look for a prefix N or NA.  If you adopt an early Commando box which is a type of NA series you may have to fit a Dominator main-shaft depending on the clutch you use.  These message boards are intended to be used as a Technical Message Board for reference and so more care needs to be taken by readers and contributors so that incorrect advise is not included nor heeded.  If Mr Arthur will edit his input I shall be pleased to remove my input.  Regards, Howard

Re: Right gearbox?

Posted by ian_cordes at November 19. 2018

Agreed, the Matchless gearbox will not fit. Also, Anna already said it should be stamped N, which is correct.

Re: Right gearbox?

Posted by Dave Young at November 19. 2018

Many thanks to all of you for your responses - I will look into Anna’s advice as this would tie in with my engine number 99C2381; but on the front of the engine there’s a solitary H and being a bit of a novice don’t know what this means.  Thanks again for all your comments so far, Dave.

Re: Right gearbox?

Posted by Dave Young at November 19. 2018

Previously alex_arthur wrote:

Dave, to add to Anna's advice, your bike would originally have had an 'N****' series serial number box. The later NA series will also fit as will M and (later) MA (Matchless) boxes as they are essentially the same. The later boxes have a better ratio selection for 3rd gear. Commando boxes for RH change bikes will also fit but will need a spacer (1/8" iirc) on the top mounting bolt. As it happens, I have a spare N series box...

Re: Right gearbox?

Posted by Dave Young at November 19. 2018

Hi Alex - you mentioned that you have a spare N series gearbox - would you be prepared to sell and if so how much would you be looking at?  Could you please upload a pic so that I can see the condition too?  cheers

Re: Right gearbox?

Posted by alex_arthur at November 19. 2018

Howard is quite correct; apologies for the incomplete info, I should wait till I am awake before hitting the keyboard.

Dave, could you pm me and I will call to describe the box I have available.  It is currently stripped so photos are not a problem, but you may be aware that gear condition etc is very difficult to photograph without it being  potentially misleading.

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