5 replies to this topic

[Ace of Clubs]

Preferably without bothering Guessworks (as I 'm sure he must be sick of box questions) but ......

Does anyone know if there is a master list of all A and A+ gearboxes with ratios and type of car found in ?

Hopefully with ...

Practical uses.
Evaluation one vs another
Casting numbers
Internal ratios
Final drives

etc etc

Any help much appreciated.
Ta.

[Guess-Works.com]

http://www.guess-wor...ox/index_R.html

**** 3 Synchro Boxes ****
3.627 2.172 1.412 1.000 MKI Mini Pre '64 (Magic Wand)
3.520 2.210 1.430 1.000 MKI/II Mini Post '64 (Magic Wand)
3.200 1.916 1.357 1.000 MkI/II Cooper & MkI/II/III Cooper 'S'
2.573 1.722 1.255 1.000 MkI/II/III Cooper 'S' (Close Ratio / Straight Cut )
**** 4 Synchro Boxes ****
3.330 2.094 1.353 1.000 MkIII Cooper 'S' & 1275 GT (Close Ratio)
3.520 2.210 1.430 1.000 MKIII/IV Mini & Metro (pre A+ <'84)
3.647 2.185 1.425 1.000 MKV/VI/VII Mini, ERA Turbo & Metro (A+ >'84)
4.004 2.307 1.435 1.000 Metro 1.0 HLE
**** Aftermarket gear sets ****
2.583 1.711 1.250 1.000 Minispares (Clubman ratios CR/SC) C-STN39
2.544 1.731 1.258 1.000 Minispares (Abingdon ST ratios CR/SC) C-STN77
2.313 1.567 1.187 1.000 Minispares (Metro Challenge CR/SC) nla?
2.544 1.731 1.258 1.000 Minisport (Abingdon ST ratios CR/SC) GRBMS4014
2.544 1.731 1.258 1.000 TRAN-X (Abingdon ST ratios CR/SC)
2.583 1.711 1.250 1.000 TRAN-X (Clubman ratios CR/SC)

There is one more which is in some of the last twin points, noted by the double grove cut in the gear... I've just not bothered counting the teeth yet on them, but I think it's the same as the 1.0 HLE Metro

Edited by GuessWorks, 12 September 2007 - 10:16 AM.

[Guess-Works.com]

Final Drives...

A series

CROWNWHL TEETH RATIO PINION TEETH
22A411 62 3.444 22A413 18
22G940 62 3.647 22A399 17
22A401 64 3.765 22A399 17
22G340 63 3.938 22G338 16
22G101 62 4.133 22G99 15
22G370 64 4.267 22G99 15
22G443 65 4.33 22G99 15

A+

CROWNWHL TEETH CASTING NO. RATIO PINION TEETH
DAM3645 65 DAM3546 4.333 DAM3647 15
DAM3216 63 DAM3217 3.938 DAM3218 16
DAM4162 62 DAM4163 3.647 DAM4137 17
DAM4779 64 DAM4780 3.765 DAM4131 17
DAM2677 62 DAM2678 3.444 DAM2679 18
DAM6327 59 DAM6243 3.105 DAM2808 19 12" WHEEL
DAM2806 61 DAM2807 3.211 DAM2808 19 TURBO
DAM5925 59 DAM5926 2.95 DAM5927 20 988C ECON.
TCB10004 58 TCB10005 2.76 TCC10001 21

A PLUS TYPE PINIONS HAVE BOTH SIDES MACHINED FLAT.

For reference...

Auto's

CWP 69/25 (2.76:1) or..
3.27:1 (not seen one but 72/22 would be about right)

Edited by GuessWorks, 12 September 2007 - 10:36 AM.

[Ace of Clubs]

Thanks John - you're a star.

I should have thought that you might have it on your website !

[pepote97]

Hello, Nonencounter information of my gear box. Externally it has a reference that puts 1X12540R so and as one is in the following image.



The gear box, belongs to a motor AUTHI Cooper 1300 of year 1974 made in Spain.

This is the image of motor:



I would like to know if she has some equivalence with your gear boxes. The “FD” is 62/19=3.26315789.

A greeting

[Guess-Works.com]

The place you have shown on the front of the gearbox is not a BMC mark, but a postproduction identification probably by a gearbox reconditioner.. ( I use the same spot to mark gearboxes )

The actual raised casting there is just accidental, and is a result of the molds to create the part where the oil strainer is connected on the inside of the box.

But what I can tell you is the engine originally was early 1275 GT engine, with an A series gearbox... but both have been remanufactured.