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Rear end ratio: 3.31 or 3.54? 200

posted by  someone claiming to be philip bradley on  Fri Mar 29 09:15 CST 2002 [RELATED]

My 89 745T with a 3.73 final drive ratio turns 2350 rpm at 60 mph in OD with the AW71 trans. Note that people often mix up the rear gear ratio with the final drive ratio. My rear gear is 4.10, but my final drive ratio is 3.73 due to the OD reduction from the 1:1 third gear (AW71).

For driving fun, I recommend swapping to the lowest gear (highest numerically) that Volvo used in a rear that can easily be swapped (i.e., same speedo sender if applicable). With OD, a low gear is not too noisy and does not consume too much fuel. You would have to find something from the aftermarket to suffer really adverse consequences in those respects. One benefit of swapping, if you get the whole rear axle (which is the easiest way to do a swap) can be a limited slip or auto locking rear, newer rear wheel bearings, and newer parking brakes.

Philip Bradley






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