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Gearboxes
Synchromesh Transmissions vs Dog engagement
Created: April 25, 2014
Dog engagement is typically limited to racing applications where fast, precise shifting is needed. Dog gear engagement works by having numerous large teeth or ‘dogs’ that mate into matching openings machined into the opposite surface of the drive gear. Unlike the synchro engagement, there is no synchronizing mechanism to assist in equalizing speed.
Created: February 06, 2014
Evo (Trannex) 1950s design with 1990s engineering and technology - originally done by the inimitable Davc Hirons at Trannex, now under the EVO banner at Mini Spares Centre following their buy-out of all the Mini/Sprite Trannex products some years back now. The only real similarity to the old Sali...
How do I know which transmission my Mini has?
Created: January 20, 2014
It’s really quite easy to tell which generation of gearbox, shift linkage, and axles your Mini has. Let’s say you want to order a replacement but terms like “remote”, “rod-change”, or “pot-joints” have you a little befuddled about just what the heck to order! Let’s very simply describe the three styles of transmissions and axles used in the production of the Classic Mini.
Classic Mini Gearbox Rebuild - Mini Mania Video
Created: March 11, 2011
Classic Mini Gearbox Rebuild - Part 1 Gearboxes may seem complicated but they are very simple in their construction, and surprisingly easy to put together. The main issues are having the right tools to do the job.
Created: June 19, 2008
Gear Box Rebuild Written By GuessWorks Gearboxes may seem complicated but they are very simple in their construction, and surprisingly easy to put together. The main issues are having the right tools to do the job. So here's a list of what you will need. SEE VIDEO HERE Torque Wrench with a...
Quaife Limited Slip Differentials - Classic Mini Cooper
Created: January 26, 2006
The Quaife Differential powers both drive wheels under nearly all conditions, instead of just one. With an ordinary open differential, standard on most cars, a lot of precious power is wasted during wheelspin under acceleration. This happens because the open differential shifts power to the wheel with less grip (along the path of least resistance). The Quaife, however, does just the opposite. It senses which wheel has the better grip, and biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel.
C-AEA3240 - REPLACEMENT FULLY-FLOATING PRIMARY GEAR BUSHING
Created: April 15, 2005
Replacing the bushing and machining the bearing surface to give the correct bearing to crank clearance will often not resolve the problem since it is likely the journal itself will be damaged/become over-sized.
Created: February 10, 2003
Whether you've just ordered yours, or would like to see how to install one if you DID order one ... here are instructions with step-by-step photos
Created: October 31, 2000
The standard drop gears are fine for practically all road use - almost irrespective of power output. Despite what many folk believe - they are more than strong enough, and will perform perfectly well if correctly set up. That means getting the idler and primary gear end floats right, and using new bearings for the idler gear at each re-build.
Created: October 30, 2000
Elsewhere we've considered what alternative standard production ratios are available - but that still leaves you with the power-consuming and limited-ratio alternatives helical tooth type gears. Not desirable in a competition orientated car. The solution to this comes in the form of several types of straight-cut gear sets
Created: October 30, 2000
The standard diff unit’s componentry falls well short in the performance stakes. As an absolute minimum you should fit an up-rated diff-pin - whether this is because your racing regs don’t allow alternatives, or merely for the road - along with new planet-wheels and thrust washers.
GEARBOX - How they work
Created: October 25, 2000
Having decided on or even implemented a course of action to bolster the performance of your Mini’s engine, maximising it’s potential should encompass a good look at the gearbox. It rarely does, as most folk take one look at those seemingly formidable teeth and decide it's not for them and stay well clear.
Created: October 24, 2000
Mathematical formula for determining final drive ration when tire size and engine speed are a factor. These are for common tire types, and accurate enough for assessment - a combination of using industry standard for theoretical calculation, actually measured assortment of wheels/tires, and calculated averages! Applying the formula to a modern Mini with 12” wheels gives the following
GEARBOX - standard production gearbox types
Created: October 24, 2000
I’m sure we’re all aware of Sir Alec Issigonis’ brilliant solution to the gearbox location in the Mini - just fold it up underneath the engine, simple. Following is a résumé of the production gearboxes to date. The first Minis rolled off the production line with a three-syncro gearbox,
Created: October 17, 2000
‘Salisbury’ is the word banded about by most un-enlightened folk when discussing LSDs for Minis, mistakenly believing the word covers all Mini orientated LSDs. This is grossly incorrect. The ‘Salisbury’ was designed in the ‘50s at a time when racecars were a good deal less sophisticated than today. Tyres were usually cross-ply with severely limited grip due to poor compounds developed ostensibly for rear-wheel-drive cars; the front wheel drive of the Mini being a rarity.
Created: January 30, 2000
Mini Mania is the sole US representative of the excellent "Tran-X Limited Slip" differential. Basically a clutch type diff, it is a 1950's ideal incorporating a 1990's technology. It is much more refined than the previous plate type diffs.
Magnetic oil trap, C-2A3637
Created: January 30, 2000
Installation of this kit involves opening and re-sealing the oil suction passage. Improper sealing can result in low (or no) oil pressure and subsequent engine failure. Always observe the oil pressure
Created: January 29, 2000
Insert the idler gear with the thrust washers it came with into the gearbox. Bolt the end casing in place with the gasket. Tighten to the spec torque. Measure the idler gear float with a feeler gauge. It should be ~0.003". If it's more than that, and it always is, insert the appropriate OVERSIZE thrust washer. These are available from Mini Mania. I forget what the oversizes are but they are stated in most parts manuals. Thanks to Johnny B I have a complete selection in stock for all my rebuild jobs :-)
Quick Shift Kit, Remote & Rod change type, C-22A1750 & C-22A1751
Created: January 29, 2000
1. Remove original gearstick. Fit KAD Quickstick with original plastic collar, spring and spring retainer, grease well and refit with new spacer. Place flange downwards using longer 5/16" UNC capscrews.
Center oil pick-up pipe C-AHT54
Created: January 29, 2000
Risk of loss in oil pressure due to surge will be alleviated by fitting this oil pickup pipe. Please ensure that a clearance exists between the gauze and the reverse idler gear when the pipe is fitted. It is advisable that gearboxes fitted with this attachment be removed regularly to ensure that no excessive build up of sludge has built up around the gauze mesh.