Mike104 Posted November 9, 2018 Share Posted November 9, 2018 I know that the transmission and rear differential must have same gear ratio to work properly. Car in question is an 08 Impreza WRX with 5MT. According to cars101.com this was supplied with a 3.90 gear ratio. Current ebay sellers are offering JDM transmissions with matching 4.44 rear differential. Question is what would be the difference in operation if the MT/Rear Diff with a 3.90 was replaced with a MT/Rear Diff with a 4.44 ratio? 1 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted November 9, 2018 Share Posted November 9, 2018 It would accelerate better off the line. Lower ultimate top speed...... that's about it. It's not a problem at all. Makes it a lot more fun or helps correct for larger tires. Lifted WRX's are something we do from time to time and personally I like the look. Quote Link to comment Share on other sites More sharing options...
Mike104 Posted November 10, 2018 Author Share Posted November 10, 2018 Thanks GD I knew you would know the answer! Quote Link to comment Share on other sites More sharing options...
matt167 Posted November 11, 2018 Share Posted November 11, 2018 Yeah in Japan many WRX were 4.44 ratio. The expressway speed limit is 100 km/h or basically 60 mph. 1 Quote Link to comment Share on other sites More sharing options...
Mike104 Posted November 12, 2018 Author Share Posted November 12, 2018 I'm OK with my 21 year old kid only doing 60 mph! Quote Link to comment Share on other sites More sharing options...
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