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crown wheel and pinion ratios
https://www.ausmini.com/forums/viewtopic.php?f=2&t=60797		 Page 1 of 1
Author:  Boostedmini [ Tue Feb 02, 2010 6:25 pm ]
Post subject:  crown wheel and pinion ratios
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
Author:  GT mowog [ Tue Feb 02, 2010 6:38 pm ]
Post subject: 
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.
Author:  Boostedmini [ Tue Feb 02, 2010 6:58 pm ]
Post subject: 
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
Author:  drmini in aust [ Tue Feb 02, 2010 7:04 pm ]
Post subject: 
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. :wink:
Author:  GT mowog [ Tue Feb 02, 2010 7:07 pm ]
Post subject: 
Boostedmini wrote:
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


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?
Author:  TheMiniMan [ Tue Feb 02, 2010 8:14 pm ]
Post subject: 
sounds like he has an early (small diam) retainer to me
Author:  Boostedmini [ Tue Feb 02, 2010 9:09 pm ]
Post subject: 
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
Author:  GT mowog [ Fri Feb 12, 2010 5:41 pm ]
Post subject: 
GT mowog wrote:
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.


I have just found another factory listing for a 4.786:1 Ratio (14/67). Sorry no part numbers.
Author:  Boostedmini [ Fri Feb 12, 2010 9:15 pm ]
Post subject: 
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.
Author:  blue_deluxe [ Fri Feb 12, 2010 10:58 pm ]
Post subject: 
GT mowog wrote:
GT mowog wrote:
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.


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


What would have used the a 4.768:1 final drive? A super short stroke super revvy small bore?
Author:  Asphalt [ Fri Feb 12, 2010 11:03 pm ]
Post subject: 
GT mowog wrote:
Sorry no part numbers.


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
Author:  TheMiniMan [ Fri Feb 12, 2010 11:09 pm ]
Post subject: 
blue_deluxe wrote:
GT mowog wrote:
GT mowog wrote:
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.


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


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


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
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