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59 tooth crownwheel plus 20 tooth pinion making 2.95 ratio. A plus gears sold as a set only
Mini Cooper Transmission Final Drive Gear Kit 2.95:1 Ratio

Mini Cooper Transmission Final Drive Gear Kit 2.95:1 Ratio

Mini Cooper Transmission Final Drive Gear Kit 2.95:1 Ratio
Part No: CWP2.9
$336.95
Qty:
Fits the following:
Classic Mini
Alternate Products
Mini Cooper Final Drive Transmission Gear Kit 3.1:1
$336.95 Mini Cooper Final Drive Transmission Gear Kit 3.1:1
59 tooth crownwheel plus 20 tooth pinion making 2.95 ratio. A plus gears sold as a set only
 
 
Question:
To go at 80 mph and the revs no more than 4000, what ratio of crown and pinion do I have to put on.?
Answer:
I would estimate it would have to be 2.76, perhaps a 2.95 if you are running 13" wheels.  Tire diameter must be considered when estimating. Not that both choices will result in a notable lose of standing start acceleration. 
 
 
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Related Technical Articles:
ENGINE TRANSPLANTS - gearbox information
Created: November 01, 2000
Selecting the right final drive ration is a subject worthy of an entire book to explain the whys and wherefores, and also causes much consternation on the part of the transplanter. Much confusion’s spread over which gearbox has the best ratios, is best to use, and with which FD. For a detailed account on this and covering all gearboxes fitted as standard to the Mini, see the relevant separate articles 'Gearbox - Standard production gearbox types'.