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Swapping rear axels , gas mileage question 700

posted by  volvorod85 on  Wed Jan 29 18:19 CST 2003
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worse yes, but it depends on how fast you drive...I have an 85 765 turbo that had an AW71 auto with 3.73 in the rear. on trips i could only get 23 mpg (70-80 mph) I swapped the auto with an m-46, i now turn more RPM's on the freeway...at 65 ill get 26-27 mpg, at 70-80 and up ill get 23. around town with the auto i was getting 13, with the m-46 I am getting 14-15MPG. It will change, but only 1 or 2 points, maybe. you will notice it on the freeway though...there are all kinds of websites with ratio/engine/vehicle speed calculators...just punch in tire size, rear end ratio, trans ratio, and engine speed, or any combo there of and youll get an answer....






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