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Aussie gearbox ratios?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=85904		 Page 1 of 1
Author:  Kennomini [ Sun Jun 01, 2014 12:51 pm ]
Post subject:  Aussie gearbox ratios?
What I'm curious about is the different gear ratios available in Australia. I've heard Mk II S ratios are good but really what are the differences in all the different gearboxes available through Australian production?
So what are the different gearbox ratios that we can get our hands on? For example is the 850 box have different ratios to the Deluxe 998 or 1098? what do the Mk I and Mk II S's have?, Morris 1100S ratios etc etc.
What are the different gear set varieties through early Morris 850 to Morris 1100/1100S and across to the late Leyland Mokes and everything in-between :?: .

Come on brains trust share some light on this please.
Author:  Scoop [ Sun Jun 01, 2014 1:29 pm ]
Post subject:  Re: Aussie gearbox ratios?
I'm definately not one of the brains trust or know if this is australian ratios but this is what some of my books say.
850
1st- 3.627:1
2nd- 2.172:1
3rd- 1.412:1
4th- 1:1
Diff- 3.765:1

Cooper S
1st- 3.200:1
2nd- 1.916:1
3rd- 1.357:1
4th- 1:1

Cooper S option
1st- 2.57:1
2nd- 1.78:1
3rd- 1.242:1
4th- 1:1

That is what my BMC workshop manual says anyway.
Author:  Mick [ Sun Jun 01, 2014 1:46 pm ]
Post subject:  Re: Aussie gearbox ratios?
This is a page of the 6/70 version of the workshop manual, it includes an Australian Produced Vehicles Supplement and this is a scanned page from therein.

The penciled in numbers were by me in about 95 when I picked up a 3 synchro super close ratio helical cut gearbox (Lay gear 22g210) from a mini I purchased a couple of years before and pulled down. The space was blank otherwise.

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Author:  Kennomini [ Sun Jun 01, 2014 2:41 pm ]
Post subject:  Re: Aussie gearbox ratios?
How I interpret that is they have included the diff ratio in the gear ratios so I just subtract the FD and that will give the correct gear ratios right :?:
Also how do I identify them to the gearbox and year?
Author:  winabbey [ Sun Jun 01, 2014 2:58 pm ]
Post subject:  Re: Aussie gearbox ratios?
The following chart is from a BMC Australia engineering drawing and shows gearbox and final drive ratios for the A Series up to the late 1960's, so no MK II Mini, Clubman or later Moke. To read the detail you'll need to right-click and download, then view in a graphics or picture viewer. There's some interesting variations on Cooper S ratios across engine sizes and with straight-cut gearsets.


Image
Author:  Kennomini [ Sun Jun 01, 2014 3:05 pm ]
Post subject:  Re: Aussie gearbox ratios?
Are Cooper S's 3 or 4 sync's?
Author:  winabbey [ Sun Jun 01, 2014 3:08 pm ]
Post subject:  Re: Aussie gearbox ratios?
Kennomini wrote:
Are Cooper S's 3 or 4 sync's?

In general, Mark 1 is 3 and MK II is 4, although some early Mk II's in 1969 had some of the Mark 1 parts so as to use them up, including gearbox, heater, master cylinders.
Author:  Kennomini [ Sun Jun 01, 2014 3:20 pm ]
Post subject:  Re: Aussie gearbox ratios?
Yeah after looking through your charts and my books it looks like we only need 1970 and onwards info now. Anyone got Leyland details?
Author:  Kennomini [ Tue Jun 03, 2014 1:07 pm ]
Post subject:  Re: Aussie gearbox ratios?
Dose anyone know what the Leyland 1971 onwards gear ratios are :?:
Author:  winabbey [ Tue Jun 03, 2014 1:15 pm ]
Post subject:  Re: Aussie gearbox ratios?
Kennomini wrote:
Dose anyone know what the Leyland 1971 onwards gear ratios are :?:

Have you looked in the Sales Brochures section?
Author:  Kennomini [ Tue Jun 03, 2014 3:50 pm ]
Post subject:  Re: Aussie gearbox ratios?
Had a look in the Brochures section and found these;
1971 Leyland mini:
1st-12.89 9.21
2nd-8.09 4.44
3rd-5.23 1.58
4th-3.65 1.1
(If my maths is correct).

1971 GT:
1st-11.02
2nd-6.60
3rd-4.67
4th-1.1
FD-3.44

Leyland van:
1st-3.51
2nd-2.22
3rd-1.43
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