Hi all,

does anyone have a list of the available ratios available for the A series gearbox?
i have just found out the A+ pinion is much larger than the A series.

I wont to get down to around 3.2:1

Grant

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

In Factory Ratios you have;-

2.76:1
2.95:1
3.105:1
3.211:1
3.44:1
3.647:
3.76:1
3.938:1
4.133:1
4.267:1
4.33:1

So there is a bit of choice, there's even the 3.211:1 that your looking for.

After market ones go down to about 2.5:1 up to about 4.5:1.

Thanks GTMowog.

are you sure they all fit a A series box?
I have bought a 3.2 from Mini spares and pinion does not fit as it is to suit an A+

Grant

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

They all fit into an A series box but anything taller than 3.44 you have to machine out the 3rd motion shaft bearing retainer to clear, if it's a remote box.
Rodchange boxes have more clearance there.

Bring the retainer over with pinion, or take it to GR.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Yes, all the factory ratios will however you may have to change the 3rd motion shaft bearing retainer, that's the 'C' shaped plate that sits over the pinion and held in place with 4 bolts. <EDIT> the one you may need goes under P/N DAM5996.

I've fitted all these ratios to various 4 syncho gearboxes - Remote, A Rod & A+ Rod change without problem.

Why doesn't your 3.2 from Mini Spares fit? Is it a factory one or after market?

sounds like he has an early (small diam) retainer to me

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

yeah thanks Guys,

done some searching and found there is a different C plate on later boxes (A+) i will go through a few of my other boxes and see what i can see.

if i dont have one i guess i will mod my current one, should be able to spin it up in the lathe with a 4 jaw chuck easily enough.

Thanks again guys

Grant

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

I have just found another factory listing for a 4.786:1 Ratio (14/67). Sorry no part numbers.

well in the end i used my die grinder to open up the 3rd motion bearing retaining "C" plate and it all fits up ok.
box is all but done now just the diff shimming to go.

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

What would have used the a 4.768:1 final drive? A super short stroke super revvy small bore?

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Simplify and add lightness

May contain the odd error;

A- ratios:

Ratio - teeth - part n° pinion/crown:

• 3,44:1 - 18/62 - 22A413 - 22A411
  
• 3,65:1 - 17/62 - 22A399 - 22G940
  
• 3,76:1 - 17/64 - 22A399 - 22A401
  
• 3,93:1 - 16/63 - 22G338 - 22G340
  
• 4,13:1 - 15/62 - 22G99 - 22G101
  
• 4,26:1 - 15/64 - 22G99 - 22G370
  
• 4,33:1 - 15/65 - 22G99 - 22G443

A+ ratios:

Ratio - teeth - part n° pinion/crown:

• 2,76:1 - 21/58 - TCC10001 - TCB10004
  
• 2,95:1 - 20/59 - DAM5927 - DAM5925
  
• 3,11:1 - 19/59 - DAM2808 - DAM6327
  
• 3,21:1 - 19/61 - DAM2808 - DAM2806
  
• 3,444:1 - 18/62 - DAM2678 - DAM2677
  
• 3,647:1 - 17/62 - DAM4137 - DAM4162
  
• 3,765:1 - 17/64 - DAM4131 - DAM4779
  
• 3,938:1 - 16/63 - DAM3218 - DAM3216
  
• 4,133:1 - 15/62
  
• 4,267:1 - 15/64
  
• 4,333:1 - 15/65 - DAM3647 - DAM3645

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No speakers, no bodykits, no six-inch spacers, no spak filler, no bullshit

the factory suppied LSD "type" cw&ps in various ratios,,, i remember my dad talking about a 4.6 & 4.8 ratios being supplied back in the day , so i suspect the 4.8 is the one that GTMowog has listed as a 4.786

& i have heard of an even zippy-er one again but it may have been an after-market jobby

& yes they`re for super high rev engines & short tight race tracks & hillclimb-cars etc

very small diam pinions & often broke-upart because of that so definately not suitable for road use at all

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.