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4.11 and 3.73 are usually final drive gear ratios, the gearset in the differential. the gear ratios in a transmision are found the same way. There is a gear ratio for each gear in the transmission, for example a five speed transmission will apply five different gear ratios to the output shaft of the transmission: first gear 2.315:1, second gear 1.568:1, third gear 1.195:1, fourth gear 1.000:1 and fifth gear 0.915:1. basically when you shift into a gear you are connecting the input shaft of the transmission to the output shaft of the transmission, this is how you get your gear ratios in the transmission, two different size gears in contact with each other. unfortunatly I don't know the gear ratios of any of the volvo trannys.If I knew the gear ratios for these transmissions I could answer your question a little better. If the transmission you put in your car has lower gear ratios throughout all the gears than the one in it now, you should get a quicker acceleration(shifting gears sooner)and you might notice an increase in fuel consumption but with the same final drive ratio you may lose some top speed or be at a much higher RPM say doing 65 or 70 MPH than you where before, it will be just the opposite for a transmission with a higher gear ratio than the tranny in your car now. All in all it really boils down to your final drive gear ratio witch is the gearset in the differential. It is real easy to get yourself into a bit of trouble when changing final drives, nothing like doing 70 MPH in fifth gear with your tach redlined. well, I hope this helped you a little good luck with your transmission swap.
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