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Car Forum / MINI / February 2004final drive ex metro in mini
is it possible to fit a auto final drive into a manual box as its a 2.760 rather than standard 3.444 i know a loss of get up a go______ but what a top end if i can get it to rev Hi, I seem to remember that it will not fit, but I cannot remember why!! Keith has to be modified to fit but also the ratio is not suitable its too high. > Hi, > I seem to remember that it will not fit, but I cannot remember why!! > > Keith > is it possible to fit a auto final drive into a manual box > as its a 2.760 rather than standard 3.444 > i know a loss of get up a go______ but what a top end if i can get it to > rev Now i thought mini's had shorter FD's when autos? (3.44) 2.76 sounds like a twinpoint FD. AFAIK, there is a mod needed b4 you fit this to any old box. Due to smaller pinnion being larger than other FD's. I nicked this from www.calverscorner.com ; IMPORTANT NOTES: - Although some gears have the same tooth count for different ratios, they are not interchangeable - hence the need for distinguishing part numbers. Therefore use in known pairs only. - A+ gears have a different tooth profile to pre A+, so they are not interchangeable. - A+ pinions can be identified as they have flat machined surfaces on either side, pre A+ ones have a shoulder on one side. - A+ crown wheels have casting numbers stamped into them that are different to their actual part numbers, so refer to table. - Pre A+ gearboxes, and A+ gearboxes having cast centre main bearing retainers will have to be modified when fitting 3.1/2.9/2.76 FD. This is because the pinions are much larger on outside diameter than the others. Some later sintered retainers may also need modifying. Always carefully check for clearance before finish-assembly of these parts. The modification is a simple filing out procedure. ^^^^^LOOOK^^^^^ HTH chris > is it possible to fit a auto final drive into a manual box > as its a 2.760 rather than standard 3.444 No. thanks for any or all info look like a few leads to look up on thanks all > is it possible to fit a auto final drive into a manual box > as its a 2.760 rather than standard 3.444 > i know a loss of get up a go______ but what a top end if i can get it to > rev a carb Min will not succesfuly pull the 2:76 diff, a similar size is fitted into the last of the Rover Coopers and will pull it off the line due to the increased touque the injection developes, but I really wouldn't suggest going any lower than 2:9 in a carb model > is it possible to fit a auto final drive into a manual box > as its a 2.760 rather than standard 3.444 > i know a loss of get up a go______ but what a top end if i can get it to > rev there are quite a few diffs that you can use in a mini, assuming its an A series, not an A+ you can use 2.9 3.1 3.4 3.44 3.7 3.9 and 4.1, the 2.76 auto needs its own housing and box so is tricky to the point of dont bother. (cant remember the range available to A+ boxes.) as most standard mini's 850 1000 1100 and 1275 on 10 inch wheels use the 3.4 or 3.44, it does give you some tolerance either way if you want more top speed ( at cost of acceleration) or better acceleration at a cost of top speed. bear in mind, that bigger wheels will also have an effect, although some very low profile 12 or 13 inch tyres will be no bigger than 10inch standard tyres. you can also obtain different ratio drop gears, you'll have to forgive my memory, but i'm sure you can get a lower ratio drop set, that will effectively make the gears seem closer ratio's and reduce the overall gearing a bit. most radical i have ever used was a 2.9 in a Mini Marcos with 165/70 10 inch tyres that gave 20 mph per 1000 rpm, sadly even on a reasonably warm 1275 it wouldnt pull more than 5500 in top on the straight, managed a bit more downhills with tail winds tho!! and at the other extreme a Marcos race car with a 3.9 diff on 175/50 13inch tyres which would pull 8000 in top at 16 mph per 1000 rpm and still out drag caterhams off the line!! but it did push 118bhp at the tyres! jimboooo ps the race engine is for sale at the right price, email me for full spec and price (remove .nospam from address) > a carb Min will not succesfuly pull the 2:76 diff, a similar size is fitted > into the last of the Rover Coopers and will pull it off the line due to the [quoted text clipped - 5 lines] > > i know a loss of get up a go______ but what a top end if i can get it to > > rev Do you still have the Marcos Jim? I'm currently resotring a 1968 Mini Jem. running an MED 1380, straight cut box and LSD, engine is showing 148bhp on the bench dyno > there are quite a few diffs that you can use in a mini, assuming its an A > series, not an A+ you can use 2.9 3.1 3.4 3.44 3.7 3.9 and 4.1, the 2.76 [quoted text clipped - 38 lines] > to > > > rev > you can also obtain different ratio drop gears, you'll have to forgive > my memory, but i'm sure you can get a lower ratio drop set, that will > effectively make the gears seem closer ratio's and reduce the overall > gearing a bit. No diff ratio or drop gear ratio can change the ratio spacing of your gearbox! If your gearbox ratios are (for example) 4 : 2.5 : 1.5 : 1, multiplying them all by any number you like will still leave 4 gears with the relative ratios of 4 : 2.5 : 1.5 : 1. |
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